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2 Years of Service
I don't keep track of any games I play. I just use my memory to recognize the games I played before when I see them. Maybe I should use some of the tracking methods described here 
I delete the files (to save room) and keep the folder so I know the name of the ones I liked.When I try out a game, I make sure to index it in different notepads depending on if I have no interest in the game, a "meh" category, and finally an active update one.
I always make sure that I include the latest version, where I found it, and maybe some notes to help me remember what it was about.
What about everyone else? What do you all do, if anything?
Same here, keeping the version number is the key factor. Sometimes a game that is labeled as complete can get new content.I keep games I've downloaded in a folder with their version number, and if there is ever an update I just check if the new version number is higher than the one I have saved.
This site provides links to other sites/services, and does not store any files