I've got another cool publisher for everyone to check out: Between the Lines. When I first heard about this publisher, I wondered if they had some connection to the well-known newspaper. As far as I can tell, they don't have any connection to one another beyond the name.
They publish books on politics, and they have a great selection, including stuff by bell hooks and Noam Chomsky. They have books on poverty, a story about a Kurdish man, and even oil drilling in Latin America.
I don't know about anyone else, but with all these great smaller publishers I'm finding, Christmas can't come soon enough.