I’ve been using firefox 3 on my notebook since beta3, and loving its lower CPU and memory needs, but have been frustrated by the lack of 64 bit builds for my 8Gig RAM desktop development and VMWare system.
It seems that they have been building 64bit binaries for quite some time – see their nightly build dir.. http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/
NICE!