Some people think that werebeast sightings just don't happen anymore.
After all, unless you go looking in some really obscure places, you
probably don't hear about any modern werewolf sightings.
The average modern American has heard, from time to time, a fair amount of stuff about sightings of various supernatural phenomena from ghosts to vampires to psychics and so on, but few have heard the least bit about shapeshifter sightings except the occasional tabloid article.
Yes, a fair number of the sightings do appear in
tabloids, but that's because normal publications won't touch them. A
common perception about tabloid stories is that they are entirely made up.
In truth, most tabloid stories are based on at least a grain of truth; and
so many different weird things are actually reported by people that they don't really need to
make things up. This is part of why tabloids haven't died out; they like
to base their stories on weird reports really made by people so that they
can refute charges that they totally made up their stuff. They do
exaggerate a lot, and use supernatural sensationalism, and they like to
accompany their articles with really bad phototouched photos, but many of
their things are culled from things such as reports of paranormal
investigators and articles in places like 
Africa where magic is taken more
seriously and weird sightings actually make it into real newspapers.
And then, of course, many modern sightings have nothing to do with tabloids. Any anthropologist living in a primitive region, if they ask the natives about shapeshifters, hears more stories than they can write down, stories that were supposed to have happened recently, and that are often solemnly sworn to as truth by reputable and respected elders.
The sources for modern sightings are myraid. Here, I'm hoping to create a meager guide to at least some of the more famous and interesting cases. I don't nessessarily believe they are all true, but they are certainly food for thought. And the similarities with ancient folklore, and from culture to culture, are certainly intriguing.
One source for some modern claimants is, of course, the usenet newsgroup alt.horror.werewolves. Every so often, someone comes out claiming to be a shapeshifter, or claiming to have seen shapeshifting in another person. And, if you search patiently back through DejaNews, the cases are nearly endless.
Another intriguing offshoot are bigfoot sightings. Many varieties of fur-covered humanoid, both big and little, are reported from pretty much every area of the world. Many people have suggested that such sightings could be sightings of shapeshifters in the earlier part of their transformation. Some of it borders very much on shapeshifting folklore, and occasionally furry humanoids with very non-ape-like doggy snouts are sighted, or a furry humaniod is seen changing a bit farther. And a small portion of the sightings have very explicit connections to shapeshifting folklore. Rather than believe that dozens of races of ape-men have managed to survive uncaptured (seeming to be able to disapper into thin air almost) since prehistoric times in all parts of the world, isn't it easier to believe that these brief glimpses of furry humans are really shapeshifters?
One of the more interesting modern sightings concern the werewolf or
werewolves that haunt the area around Bray road between the towns of
Delavan and Elkhorn in Wisconsin. Many people have seen this creature or
creatures, and it includes sightings of bigfoot-like creatures as well as
"bigfoot with a wolf snout" creatures and full wolves.
Single sightings as
well as the whole story have been in many different publications,
including tabloids but also more reputable publications. Here is a partial
index of sources and articles for these cases:
In "Strange Magazine" #10, Fall/Winter 1992; pages 19-21 and 44-46.
Article titled "The Bray Road Beast: Wisconsin Werewolf Investigation" by
Scarlett Sankey.
Also in "Strange Magazine" #11, Spring/Summer 1993; pages 36-37, 45.
Article titled "The Bray Road Beast: Update" by Linda Godfrey.
In "Fortean Times" #108, March 1998; page 47. Article titled "The
Wisconsin Werewolf" by Loren Coleman.
In the book "Unexplained!" by Jerome Clark, pages 519-527
I know I've seen some other "Wisconsin Werewolf" articles too, especially
in tabloids, but I can't seem
to track them down.
The Bray Road Beast A complete history of these werewolf sightings
Haunted Wisconsin: The Bray Road Beast
Beast of Bray Road: Author Interview
Weird Wisconsin: Evidence of Occult Activity in Walworth County A site that has quite a bit of detail and a number of articles about every aspect of the Bray Road Beast, including the hilarious media circus that developed after the sightings. See cubs, this is why you shouldn't run around letting everyone see you as a werewolf! Highly recommended.
Another modern-day case is one I wrote an article about, but I can't seem to find where it came from. It concerns werewolves in India.
In "Beyond" during the 1960's, there were several articles about werefox sightings, including encounters between fox-women and Vietnam soldiers. The source for this info is : Adam's Fox Box, which is sadly no longer online.
Another modern werewolf sighting is that of The Morbach Monster.
A tabloid article of more than ordinary interest is "Devil's Curse turns Girl into Werewolf" in the March 14, 1995 issue of "The Sun". This one includes alledged photos of the transformation taken by her husband.
In an article entitled "Black Magic Casts a Deepening Spell over Troubled Haiti", appearing on the front page of the October 20, 1988 edition of the Wall Street Journal, several cases of lycanthropy are reported, including a man who was killed by a mob for allegedly being a werewolf.
Books:
Here are some books which include modern werewolf (or werecat or were-whatever) sightings:
Steiger, Brad: The Werewolf Book (Has a few sightings, buried by the other material. Several of the stories seem to have been picked up online) 
Clark, Jerome: Unexplained (Has a werewolf section of 5 or so pages that is mostly sightings)
Godfrey, Linda: The Beast of Bray Road
Grant, John: Great Mysteries
Greene, Rosalyn: The Magic of Shapeshifting (Numerous, including crow, cat, and werewolf)
Hall, Jamie: Half Human: Half Animal: Tales of Werewolves and Related Creatures (a lot of material in here, especially about things like werehyenas)
Otten, Charlotte: A Lycanthropy Reader (Werewolf sighting by a Texas housewife)
Mason, Herbert Molloy: Secrets of the Supernatural
Seabrook, William: Witchcraft: Its Power in the World Today (Werewolves and werepanthers and werehyenas)
How and Where to Report your own Sighting
Have you sighted a werebeast? Want to tell someone but you're too smart to
try to convince the local police? Who will listen to your
story? Basically, just two groups: some kinds of paranormal investigator,
plus folklore collectors (who will listen and record your story for
posterity, but won't believe it). Many paranormal investigators aren't 
going to believe werewolf reports, because they are just too far
out. The few that will investigate such things only investigate certain
types. If no one else saw what you did, or, worse yet, if you yourself are
a werewolf and you're trying to report one of your own experiences, don't
expect them to take it too seriously. But if anyone else can corroborate
your story, and you're a truthful adult with some kind of reputation, and
you're willing to be interviewed and questioned, they might pay
attention. In other words, if you're planning on sending in anonymous
reports by email or something, or you're a teenager, you shouldn't even
try.
Here are some non-tabloid magazines that report about paranormal and weird phenomena, and occasionally werewolves or things similar to werewolves:
The Anomalist
Fenner Reed and Jackson
P.O. Box 754
Manhassett, NY 11030
Fate
Llewellyn Worldwide
Box 64383
St. Paul, Minnesota, 55164
Fortean Times
Box 2409
London, NW54NP, England
Strange Magazine
P.O. Box 2246
Rockville, MD 20847
Paranormal/ Strange Phenomena Study Organizations:
Center for Scientific Anomalies Research
Department of Sociology
Eastern Mighigan University
Ypsilanti, MI 48197
Collectors of Unusual Data- International
c/o Raymond Nelke
2312 Sheilds Ave.
St. Louis, MO 63136
International Fortean Organization
P. O. Box 367
Arlington, VA 22210
Occidental Society of Metempiric Analysis
P.O. Box 203
Simla, CO, 80835
Society for the Investigation of the Unexplained
Box 265
Little Silver, NJ 007739
Society for Scientific Exploration
Box 3818, University Station
Charlottesville, VA 22903
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