Just found out that Crime and Suspense is relaunching with their first issue due out in November. They're looking for flash and short stories in the 2000 - 6000 word range. The new managing editor is Fred Snyder. The pay is $5 to $10 http://www.crimeandsuspense.com/
I ran across this new zine at the Big Adios site. It's called Hard Feelings http://hardfeelings.wordpress.com/ No fiction but if you're into the very dark crime fiction they have articles and book reviews that might interest you.
Also I stopped by the New Mystery Reader site today and their September issue has gone live with reviews and a flash fiction piece. They're also advertising for someone to write reviews and summaries for the site if anyone is interested in this sort of work. No pay, but good experience if you're looking to get into reviewing. http://www.newmysteryreader.com/