Less Than Three Press has two anthology calls posted.
The first is "If You're Reading This" with a February 28, 2013 deadline for up to 10,000 words with the central theme of "messages cast adrift". Stories can be in any genre. Payment is $200 plus 5% of gross subscription sales.
The second is "Proud to be a Vampire" with an April 30, 2013 deadline for vampire stories of 15,000 to 50,000 words. Payment here is royalties only.
You can find all the details here