It looks like the Firefox 2.0 code freeze has now taken place and the frozen builds are available on the Mozilla FTP. This build should be very similar to the one that gets released on May 9 so if you are impatient then go ahead and check out this build. New features that I have found so far is the spell checking capabilities and new Add-Ons Manager. If you notice anything else please feel free to let me know.
The downloads of these builds are listed below but they are NOT THE OFFICIAL ALPHA 2 BUILDS (those will be out on May 9) but should be very close to the official build.