The Boondocks is one of my new favorite comics. It's actually been around for quite some time, and I can even remember when it started being carried in most papers and such, but for some sad reason it didn't really catch my attention until it became a cartoon on Adult Swim. After catching a few episodes there, I went out to start reading the strips, and they're definitely well worth the read.
The best thing about it, in my opinion, is that it's got a good mix of urban social commentary and liberal-flavored political commentary, but even while putting all this out there, it doesn't fail to take potshots at itself and those fields as well - Huey (the protagonist) is usually the voice of reason, of educated African American youth, but his extremes play off of Riley (his younger and generally more sterotypical brother) and his views aren't safe either - like the cartoon episode regarding wanting to "tell white people the truth".
It's just a great read, almost always has a great laugh, and manages to sneak a few good messages by in the process. Check it out.