Andy Baio has compiled a listing of metagames, which are, in essence, video games about video games.
Over the last few years, I’ve been collecting examples of metagames — not the strategy of metagaming, but playable games about videogames. Most of these, like Desert Bus or Quest for the Crown, are one-joke games for a quick laugh. Others, like Cow Clicker and Upgrade Complete, are playable critiques of game mechanics. Some are even (gasp!) fun.
Since I couldn’t find an exhaustive list (this TV Tropes guide to “Deconstruction Games” is the closest), I thought I’d try to pull one together along with some gameplay videos.