Peanuts (second top) is another great comic series. I felt much of the humor was hit or miss, but you can't help but love every scene Snoopy is in. He really does steal the show.
Dilbert (below) often never made that much sense to me. My father and brother loved it though. Occasionally, however, there was a strip that made me laugh out loud, and this was one of them. It should come as no surprise that it is about writing.