clipart, free illustrations

Sometimes I like to dress up my posts with various illustrations, and then I frequently find myself wasting lots of time looking for free clipart and the like. This morning, via gmail, I found

which I will put in my sidebar if it behaves.

There must be something wrong with my "search words," since google keeps coming up with all sorts of other things. I'd really like a source for humorous, clean "cartoons."

In the meantime...