The latest 
pre-release version of Firefox 3 is available.  As a main focus of this release, performance and memory usage are improved.  In particular Zimbra, the most heavyweight web application I use, has much better performance when used with this version.  A more native look and feel on OS X and Growl notification support are nice features too.  It is enough of an improvement that I do not intend to go back to version 2 after experiencing this pre-release.
