If you're wondering when new games are added to the Games Library, there is one way to keep track (for now). You can follow us on Twitter @Amigal0ve. Each time a new game is published I will tweet about it. Currently I'm trying to backfill some of the library to catch up, but all new additions will be logged there going forward, too.
When a tweet goes out it gets bundled with some of my favorite screenshots from the game. Here's an example.