First off, if you just want to maintain a game or two, that's fine. You won't be part of the herd to do so, but you can maintain the game. The metadata.xml file will just list games as the herd and you as the maintainer. The games herd reserves the right to come in and poke on the ebuild however ;).

If you're still reading, then you probably want to join up. Here is a basic list of the expectations of a games herd member:
If you're *still* reading, then please come by #gentoo-games and talk to SpanKY about joining up. Here are a few additional notes about being with games: