I ran across nanobox.chipx86.com and found some interesting tables comparing different browser support for CSS, HTML and the DOM. Although a little hard on the eyes, I’ll give him an A for effort. Here are a couple other browser comparison links for good measure.
Wikipedia · Very comprehensive general and technical comparisons of web browsers.
Browser Speed Comparisons · The name says it all. See how your browser ranks
Webmonkey Browser Chart · There’s no school like the old school. Sweet webmonkey. Good webmonkey.
IE vs. The World: Six Web Browsers Compared · Recently put up on cNet’s site, I’m going to give you one nanosecond to guess whether IE won or not.
Mac OS X Browser Comparison · And apparently OS X has it’s own competitive universe for browsers.