So far, it seems to be that most (not neccessarily all) of the fandoms involved will be some of the smaller ones...series like SG1 and Andromeda are too big, sadly. Firefly, as far as I know, is borderline.
Basically, when we have sign-ups, everyone can say in which fandoms (from the finished list) they'd be willing to write in.
Note: if you don't see a show or event you'd want to write, just hit Reply and mention it. I'll be sure to add it to the list.
Category A: series
what fandoms would you be willing to write?
Bionic Woman (either series)
Blade the Series
The Incredable Hulk
In Plain Sight
The Inspector Lynley Mysteries
Kindred: the Embraced (tv series, not the game)
Not Going Out
Terminator: the Sarah Connor Chronicles
Category B: major events
what sort of occurances would you be willing to write?
aliens arrive/have been here
myths walk the streets*
expanding a little-known group mentioned in canon
demons (Hellboy-style or otherwise)
people arrive from other timelines/other times
the characters parodying themselves
* = no religions or religious figures, though.