Someone just posted that Firefox 1.5 is now available.
Mods pulled the thread, but I had already saved a couple of the links mentioned.
Some download locations for the 5.8 meg file are:
http://releases.mozilla.org/pub/mozilla.org/firefox/releases/1.5/
http://www.mozilla.org/mirrors.html
That was me - apparently it didn't deserve its own thread, but it's there :)
Posted from 1.5, BTW :)