About.com, Political Humor [ http://politicalhumor.about.com/ ]
The go-to source for political humor and political cartoons, updated daily with jokes, cartoons, satire, videos, and funny news.

HumorLinks [ http://www.humorlinks.com ]
Your starting point for the best comedy sites on the web. Just enter any word in the search box, or use the dropdown boxes to find the type of humor you're looking for. Then save your own private customised list of favorite comedy sites for easy access whenever you want.