Mozilla releases Firefox 3.5 today. Its x2 faster than Firefox 3.0.
Features
Private Browsing Mode
Websites Get Identified
Retrieve Recently Closed Tabs and Windows
Video Support is Augmented
Firefox Becomes Location Aware
Automatic Font Formatting
Better Manage your Add-ons
Tear Away Tabs
Colors are Corrected
You can find out what all these functions do
here!