A list of most interesting sites where you can find free apps and games for the Google open operating system for mobile, Android:
AndroLib Android specific directory with reviews, ratings, etc…
Appolicious you can search for categories
Smokin Apps nice blog, reviews, you could filter for various criteria etc…
Android Tapp reviews, news, ratings etc…
Android community forum with section for applications
Android and Me blog about all Android related, sections for apps and games
Android Market the official store for apps and games
Phandroid another blog for Android fans, with a specific category for applications
Android freeware just only free applications