Downloads available for Windows, Mac & Linux in various languages.

http://www.mozilla.com/en-US/firefox/all.html

Firefox 1.5 will be supported until 24th April 2007 with security and stability updates.

particulalry like the new Firefox "recovery" facility ie if your pc crashes whilst your browsing when you reboot and open Firefox will ask if you want it to open "as was" before the crash. Very neat idea.
I know with IE7 MS nicked all Mozilla's ideas but I'm pretty sure that IE doesn't feature this useful facility so once again Firefox stays well ahead of the pack.

Can also recommend DownThemAll a plug-in download manager that integrates nicely with da 'Fox ;-)