For those readers of an academic nature who haven't heard yet, there's a general boycott of Elsevier going on, which I encourage you all to join. For anyone unacquainted with the evil practices of Elsevier check out Cosma Shalizi's links or the links on n-Category Cafe. While this is a general boycott, you can specify separately whether you (1) won't publish with them, (2) won't referee for them, and/or (3) won't do editorial work for them. For the young academics, there's also some discussion on silmaril's LJ crosspost about the potential costs of joining such a boycott. While it is a non-trivial commitment, I do encourage you to join us.
For those who believe in the public sharing of knowledge, there's also a more general pledge, Research Without Walls, to only do business with journals who provide their articles online and without paywalls. I wholeheartedly support this cause, for many of the same reasons that I support F/OSS. If you notice my name isn't on the pledge yet, it's because I need to do a little more research on which conferences and publications this would bar me from before making a public commitment to prohibit myself from (rather than merely disprefer) venues which do not support the freedom of knowledge.