Frankly I don't know whether this all work or not, but I have come to rely on CleanApp to do a thorough deletion of all remnants of an application. It will even find and delete remnants of previously deleted applications, internet plug ins, Widgets, Screen Savers, Quicktime components, Fonts, Preference panes, and Kernel extensions.
If we knew what it was we were doing, it wouldn't be called research, would it?
