The projects listed in the Google Wave API Hackathon at Googleplex, also include source code, here’s a few: -Groupy-the-bot: A Python-based robot enables users to create groups and manage their own subscriptions. -Floodit Game: where users take turns capturing as many squares as possible. -Waves in WordPress API makes it easy to embed waves in a post or page. Google already rolled out 6,000 developer accounts and plans additional 20,000 next month. Also rolling out 100,000 beta invitations to users who want to help test Google Wave starting on September 30th. You can sign up for more information.