Revo Uninstaller Portable
What's better than the free Revo Uninstaller? The portable version, which doesn't need to be installed (and thus uninstalled) itself. Like Vista's Programs and Features, Revo offers a convenient interface for launching your installed programs' own uninstallers. But after Revo does that job, it cleans up the mess that the uninstaller left behind.
Note: This link takes you to the vendor's site, where you can download the latest version of the software.