I've been collecting artwork for well over 10 years. I've been looking for software that would allow me to tag my collection like you can here and on other sites. However there just doesn't seem to be any good software out there. So I create one!

http://www.mediusgenius.com !

It's currently in beta but is fully functional and extremely flexible. Check out if you have time and you're also looking to tag files on your PC.