I've been a fan of Strange Horizons for five or six years now -- they were the first SF/F magazine I found that was publishing the sort of writing drew me into science fiction in the first place: speculation, new worlds, new ideas; as opposed to conservative apologia, retreats into old ideas, or science fascism.
They are also one of the best markets for fiction -- paying professional rates, and buying new writers. (I can tell you this is true, since I am one of the new writers they bought this year.)
Beyond all that, of course, the fiction, reviews, and essays over there are consistently worth reading.
Every year they have a fund raiser. That time is now. Chip in if you can.
1 hour ago