Internet Explorer 7 is available via Windows Update as an optional download and The Mozilla Foundation's Firefox 2.0 can be found at Mozilla's web site.

Firefox's new features appear to be primarily under the hood, with an improved rendering engine, while Explorer is keeping up with the Joneses by adding tabbed browsing. Explorer is a Windows-only product, of course. Firefox is available for a plethora of platforms - and the source code is downloadable for those of you who have something a bit more off the wall to browse with.