Below is a list of what various mentors and moderators feel comfortable writing and critiquing. Referring to it before PMing a staff member for help or critique will ensure you receive advice best suited to your genre of writing.
damien: Sci-fi, especially hard science, cyberpunk, vampire fiction, with a dabble in fantasy
Selorian: Fantasy, Sci-Fi (light, definitely not hard), & Horror.
valeca: History/historical, cultural, ritual, meta-fiction, and short humour. Emphasis on ancient to middle history.
Farror: Mostly poetry.
Aevin: Fantasy, adventure, horror and other fiction. Especially for teens. (But sometimes with more adult themes than I'd like to admit).
bobo: Fiction, or perhaps even humor or lighter non-fiction. I'll sometimes read poetry here, but will really only give my uninspired feedback on it if pressed.
Pawn: Any poetry or prose which you have a serious desire to improve.
Lisa: What I like to read/write: Poetry or short stories. Both YA and adult. Any genre (but fantasy, historical or sci-fi). Medicine, psychology, the dark side to a human's mind.
With the last thing, pretty much any story/poem that's too sexual or violent in nature to be posted in the forum can be sent to me.
Talia_Brie: I write primarily heroic fantasy and some horror. I've got an Honours degree in Creative Writing. While I actually won't be critiquing a lot here (and will probably not post anything original unless specifically requested) I will be able to give general tips etc in Writing Tips and Advice. That's where you'll see me most of the time.
silverwriter: I write mainly fantasy but will try my hand at nearly anything. For technical stuff, I'll critique pretty much anything, though I prefer fiction in fantasy, suspense, horror, or humor. I know a little about HTML, websites, blogs... Otherwise, odds and ends on a lot of subjects. Just ask. If I don't know, I'll try to help you in the direction of someone who does.
Ilan Bouchard: Hit me up with any questions regarding poetry. Most knowledgeable in sonnet and haiku forms, but I can manage with any others, I think. I can help with short stories/fiction, but I don't do fantasy or horror.