I just wanted to thank everyone that is helping here and those that put together the FAQs. I just read dano's stuff about Tools, and made Google cover art search the default action for double click. Took me a bit of reading and 2 minutes to configure.
Parameter for my custom Google cover art search:
http://www.google.com/images?q="$replace(%artist%, ,+)+$replace(%album%, ,+)"
Leave the "for all selected files" box unchecked.
I think the "replace" in the parameters can be omitted, but I know it works as it is.
Any custom tools you guys have made and don't mind sharing?