A few miscellaneous pimpings:
sgabigbang has closed Sheppard/McKay and gen signups (90 participants! Sweet!) but signups for other pairings are happening now. So if gen or Sheppard/McKay is not your thing, go take a look! Maybe you've got a Ronon/Rodney or Rodney/Teyla or OT4 fic just waiting to be written. (What? I'm biased! There are more pairings available -- go look!)
lgbtfest has sign-ups available now. As someone who has long complained that I want to see more fanfic that deals with LGBT issues without being all about hooking two characters up (i.e. gen LGBT fic, if that makes any sense) I'm thrilled by this! Shortcut to page with SGA prompts because I'm trying very hard not to sign up for anything else right now, but there are some fantastic prompts and I really hope a lot of them get written!
If there are any other Gateverse ficathons currently taking signups, please feel free to post them in the comments. These are the only ones I can think of at the moment, but I'm sure more are out there.
(And sga_genficathon stories go live on March 31st -- I can't wait! Some good stories have been turned in already ... squee!)