I hjave a lot of pictures, artwork, scans, and things that I've collecting from browsing image boards. I want to be able to 'tag' the images so that I could search for the pictures through the tags I ascribe them -- kind of like play the image labler esp game on my own collection. Is there any program to do this, or do I need to code a program to do this myself? Should I or could I hack picasa to do this effectively? It's just necessary that this would be streamlined because I have a lot of pictures to label.