The first build for the upcoming Beta 2 of Firefox 3.6 has been set free into the FTP wild. Get it here:
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/3.6b2-candidates/build1/
Multiple languages are available, so download your favorite and test their translations.
In other news, I was browsing around and came across these 64bit builds for Linux:
Are these new, I've never seen them before? Maybe Windows and Mac 64bit won't be far behind... it would certainly be nice.