Baloo
Real life caught up w/ him. I believe the problem was that, when he retired from the military, he had to get a real job, and that took up more of his time.
Elim Garak
He's been gone for quite a while. I think someone's said he still posts somewhere else, but I might be wrong...
Xentrick
Hm... His last post was in December. He seems to have simply disappeared, as far as I know...
MaGiC
She's here. Obviously you just haven't been paying attention. :-)
Ultra Magnus
He disappeared, came back for one post asking someone (Rob, I think?) to e-mail him, then disappeared again.
Jordan (aka Quatre Winner)
He's still around. He might just be lapsing from posting.
Antagonist
Looks like he disappeared a little over a month ago. I don't know why.
Sunspot
I hate to say this, but I'd totally forgot about him 'til you mentioned his name. He's been gone since September. Judging by his last post, he may have overdosed on orange juice and carrots... *L*
Jedi Weyoun
She's been gone for quite a while. I seem to recall that school caught up w/ her...