Firefox 3 faster and more stable
 

Just my experience. A few older plug-ins no longer work, but it is a better browser on a couple of older computers. FF2 would sometimes halt a system while it started, or barf on certain sites. No more.

IE8 (Beta) is pretty darned good to. It's gotten me to use IE again. But FF3 is still my main browser.

Yuppers, Me loves the Firefox. :D