I've written a fanfic for Buffy. It's not my strongest work, but I think it has the potential to explore some interesting ideas.
Anyway, check out the link bewlow >>> http://digiverse.net/vectormatrix/writing.htm
Also, if anyone is a fan of Undergrads, Reboot, Cowboy Bebop, and Enterprise... you'll find some fanfics for those shows too.
BTWL: So far the fanfic for Cowboy Bebop is my strongest story, and I think that it could almost stand alone as an interesting story for people who haven't seen the anime series.
Like any writer, I would love to get some feedback.