I realize this is goofy, but bear with me. I have a gallery of over 7000 photos. Some are daytime, some are night, some are different places, some have different subjects in them. I can't categorize them by folder alone since they have many different attributes. It would be best if I could tag them like is done on Flickr, but I don't want to use any online solution and I'd prefer to avoid special software too. Is there a way to tag the photos themselves maybe through EXIF or other meta-data? If I were to use software, all I would want is something that makes it easy to tag and manage photos without me getting stuck with something proprietary. If all the tags are in the photo itself, I can use any software I want down the road. Does this question make sense and is there such a thing? If Windows 7 has this built in somehow, that would even be better.