We are approaching the Firefox 3 launch (which should happen some time late in June).  Today, the Firefox 3 RC2 was released.  There is a very high chance that this would be the last pre-release version of Firefox 3, and be turned into the final product.  So, go grab it while it's hot!  Make sure to report any problems that you encounter with it.  The Mozilla project needs as much feedback as it can get.