Windows/Mac/Linux: Less than two weeks after they released the first beta, Mozilla is back with Firefox 3.6 beta 2. This release includes over 190 bug fixes from beta 1 in addition to the already existing performance boosts and support for one-click themes.
You can grab the latest straight from the Firefox beta page; if you're already using 3.6 beta 1, those 190+ bug fixes seem like they'd be well worth the update.
Again, this is a beta release, so only upgrade if you're an early adopter willing to deal with some potential bugs. That said, if you've been using 3.6 over the last week or so, let's hear how you've liked it so far in the comments.
Firefox 3.6 Beta 2 [Mozilla]