This is a decent product, but it could be improved upon in a few ways.
A) Don't just Google. While there are a lot of games in here, all categorized correctly (to the best of my knowledge), they're almost all big-name things, or top hot games. Games like "The New Epoch", which has undoubtedly one of the best steampunk/clockwork settings, are overlooked.
B) In depth explanation of style. Seeing D&D in a list with a game like Shadowrun doesn't really tell me much more than genre, and while it is just a "Guide to Genres", there's a difference in playing style between the two, with D&D being a slow, chip-away-the-hp thing and Shadowrun being more of a "one shot one kill" thing (though, admittedly, that is kind a Cyberpunk mainstay compared to a fantasy mainstay).
C) The links don't seem to work for me (assuming they are indeed links, and not just underlined blue text), and I'd like to see something like pricing on the list. Also, a lot of things you can get here on DriveThruRPG/RPGNow are listed as "Out of Print", which is technically true, but not very helpful in the light of the fact that there is a way to acquire them.
[4 of 5 Stars!]