Firefox 1.0.6 - free, Windows, Mac, Linux
If you haven't already, be sure to upgrade to the latest stable version of FirefoxFavicon Picker Firefox extension - free, Firefox required
Make your toolbar colorful and save real estate with eye-pleasing iconsKonfabulator - free, Windows, Mac
Run desktop widgets with the now Yahoo-owned and free KonfabulatorVirtual Desktop Manager - free, Windows only
Maintain 4 different desktops with one monitorCCleaner - free, Windows only
Clean up the crap on your PC; Firefox users, be sure to read through the tweaks to get CCleaner to play nice with the fox
