Supporting multiple browsers

http://browsershots.org/

This is an interesting site I just found out about. I'm not sure how accurate the results are and if you are really paying attention to details in your page styling, then this is too slow to be usable. However, it still gives you a quick idea of how your basic web pages look and might highlight a browser that they look bad in.

You're still better off looking at what browsers your users use and then testing with them directly.