First, thank you very much for CCleaner. It's an excellent tool. It always surprises me how much random extra stuff is stored on my computers.
Second, I've been considering writing a tool like this for myself for a while: I figure it would be useful to have a program that allows me to search my multimedia files by the last time I accessed them, allows me to preview them, and of course decide to delete them. After all, if I haven't looked at a given set of pictures for three years, I either want to know about them and see them again, or get rid of them. I've got gigs of pictures and videos that I really don't want to spend the time organizing, and having something like this to more quickly weed out old files would be great.