I've been enjoying cartoonist Peter Bagge's contributions to Reason Magazine for years now, which I've always read on their website. But now Fantagraphics has collected them into a great-looking trade paperback! Here's a PDF of a free chapter (link).
Fans of Bagge's from his HATE days are sometimes turned off by the politics of his Reason comics. I'm not. I think Bagge has been doing really interesting work, mixing field journalism with humor and opinion in an entirely novel way.
As an essayist Bagge is never preachy, and he often points out the shortcomings of his fellow libertarians (his account of meeting Ron Paul is particularly funny). He explores more than he rants, and when he does let loose, he's got a healthy sense of self-satire.
These comics will piss you off, and that's good. (Amazon link)