I just came across a new webcomic, Actively Disengaged that I thought was hilarious. If you're a libertarian, anarchist, voluntarist, or know many people who are, you might like it too.
They apparently publish weekly, and have 70 back comics, so they've been around for a little over a year. I read through the entire set, and laughed, chortled, and grimaced. The art isn't very sophisticated, but the humor is biting.
The ad I clicked on was at Day by Day, which also knows what libertarianism is, and is often sympathetic. If you are wary of nudity, this one won't be for you. DBD comes out daily, and often reacts to the previous day's news. I often click on the ads at DBD, though not many of the comics stick in my daily reading list.