I've posted several chapters, the links are:
That's Be Telling - The Prisoner
Going Platinum - Six Feet Under
Gremlins? - Dead Like Me
Freak Out - Harry Potter, Highlander, West Wing
Another Slow Night On The Hellmouth - Sandman, Discworld
Illogical Commands - Pulp Fiction
Don't think there are any others so far, but if this keeps going at this rate they may well be more - it may end up the largest Round Robin (or whatever you call this sort of thing) ever.
Later: 119 chapters and rising. Added another ficlet:
Good Dog - Dr. Who, Sarah-Jane Adventures.