I just came across this site, and I thought it was so useful, so I'd tell you guys.

Basically if your computer starts running crappily, cos your memory is being used up by stuff and you're not sure what's using it up, this is really helpful. You can put in the name of the process that's running and it'll tell you what it is and if you should keep it open, or if it's safe for closing. Also useful if you're not sure if something is spyware/adware. Most of the things I searched for, I found on this site.

http://www.processlibrary.com/

If anyone else has any good sites for computer problems/stuff like this, you can post them here too. =)