Brute Force Uninstaller!
Just found out this new tool called Brute Force Uninstaller from Merijn (of HijackThis, CWShredder fame). This tool helps to forcibly remove unwanted software from system. Here's an extract from author's site:
The Brute Force Uninstaller (BFU) is a program to help forcibly remove unwanted software and the likes from a system. It's basically a scripting engine that can execute commands from a file, much like a batch file. The list of commands is very complete and powerful, and scripts are easy to write.
Find out more about it, here.