If you are trying to uninstall an application that cannot be uninstalled by dropping it to the trash, and it was installed using Apple’s Installer, you might try the following:

1. Double-click the installer file to start a new installation.
2. Pick File » Show Files from the menu.
3. Check out
   the list of files it will install, and soon after delete them in the Finder.

[robg adds: I’ve used that technique before and it works quite well for finding all the bits of a more-complex installation.]

Original post by Michael Rose