Something I had never heard about, but I like the idea so much I gave them $25 without even reading any of their stuff. Strange Horizons:
"We're a nonprofit online speculative fiction magazine that pays professional rates for fiction; we're run by a staff of volunteers; we've published new material every week, freely available online, for nearly 8 years (and almost all of it is still available in our archives), including fiction, poetry, articles, reviews, art, and columns; we're funded entirely by donations, in a sort of public-radio-like model; in the US, donations to us are tax-deductible. Stuff we publish gets picked up regularly for Year's Best reprint volumes. Last year a story we published was on the Nebula ballot and another was on the Hugo ballot. Also, our Editor-in-chief, Susan Marie Groppie, was nominated for the World Fantasy Award."
From Boing Boing.