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Pro Batch uninstaller
Displays a list of all the installed applications with checkboxes for each, by simply checking what applications you want removed and clicking the "Uninstall" button it will automatically remove all of your unwanted apps.
Pro Free version available
However, the database is not as complete as the pro version for uninstalling/cleaning up after more stubborn programs.
Pro One-click toolbar uninstaller
Has a handy one-click toolbar uninstaller built-in.
Con License maxes out at 3 PCs
Competitors offer much more, even unlimited.
Con No official portable version
However, an unofficial portable version exists over at portableapps.com. It requires admin privileges on the computer that you use it on.
Con Runs each application's uninstaller
What IOBit does is run the uninstaller for every application that you have chosen to uninstall. Unfortunately since most of the time uninstallers require user intervention this doesn't really save you any time since you still will need to be clicking "Next" buttons.