I know that there is an online spreadsheet that some GAFfers maintain, but its kind of crap and barebones. Someone should whip up an expandable database of iDevice apps and games that includes price, release date, primary and secondary genre fields, developer, publisher, free/lite availability, universality, hardware features (gyro, tilt, location, push, retina, etc.), store links, app version, free/paid DLC availability, and a +/- point system that aggregates the overall GAF opinion for each app/game.
Adding or subtracting a point would require a valid GAF account in good standing (not banned, juniored, or even a true junior) and each user would only be able to vote a single app once. Perhaps votes could also be submitted with a short comment up to 160 or so characters. Comments could later be edited, but the initial vote would be locked unless the app sees a significant update. The comment would automatically log the newest version of the app available, for posterity.
There would have to be a core team of developers with full db access rights, but most users would be limited to just votes and comments. The UI would show the total point value of the app being looked up, and perhaps the 10 most recent user comments, with a link to see the expanded vote tally breakdown, complete with the matched individual comments.
The GAF moderation team has always been pretty reliable in sniffing out the shills, and the very nature of creating an account on GAF should keep the vote swarming and abuse that usually doom these systems down to a minimum.
Actually, the more I think of this... It'd be a ridiculous amount of work.
Still, it could be an amazing idea, and even expandable to other services such as PSN, XBLA, Wii/DSiWare, Android, etc.
Edit - the load could be lightened a bit by allowing certain trusted community power users limited db write access in order to populate new games/apps, pending verification by a member of the dev team. Other features could include links to a GAF OT for said game/app, or a link to the general game/app OT if a specific original thread hasn't been made yet.