At gocomics.com you can find a lot of comic strips (the one I like the most is Calvin & Hobbes).

Each and every day you get a new comic strip of your favourite cartoon and on Sundays some of the comic strips are even in color. The downside is that you need to install some kind of plug-in to view the comics which means that I have problems reading Calvin & Hobbes from my Sony Ericsson phone.

/Andreas