Review of Bulk Crap Uninstaller powered by the Slant community.
Free, open source uninstaller that will run on almost any Windows version.
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Pros
Pro Automatic
Can uninstall automatically.
Pro Completely free and open source
Pro Detects unregisterd programs
Can detect most applications and games (also portable and not registered), cleans up leftovers.
Pro Works even on very old Windows versions
It can even run on Windows XP, obviously with reduced functionality.
Pro Supports batch uninstalls
Not many 'free' commercial uninstaller tools support batch uninstalls at all, this one does and is completely FOSS.
Pro Has a portable version
You can choose from the installer to install the portable version.
Cons
Con Sluggish UI
When dealing with a lot of applications the UI starts to feel slow and stutters.