I found a web site which I posted in reponse to a question in another thread (Misleading? ), but I think many users could benefit from this web site and I didn't want it to be buried somewhere in a thread so I am creating this one.

This web site contains a list of Programs and Processes you would commonly find running on a Windows system and what their purpose is. If you are trying to analyze your system and come across files or processes that don't sound familiar, check this site out to see if it might help you figure it out.

WinTasks Process Library