There's a tool called msiinv.exe which will list out all the products installed on your machine that was installed using the windows installer.

Huy (one of our Setup testers) has it available at:

http://www.huydao.net/setup/msiinv.zip

 

If you ever run into issues with software that you're trying to uninstall but it isn't in the Add/Remove programs entry, try running the tool to get the Product Code, then run:

msiexec /x {Product Code}