A quick Github search turned up these: http://isaac.kearse.co.nz/2010/01/01/birdwatch/ http://isaac.kearse.co.nz/2010/01/31/stopwatch/ https://github.com/sstephenson/37signalsMenu https://github.com/ashchan/gmail-notifr

Hubcap will be when it's released (http://www.kickstarter.com/projects/1487030260/hubcap-a-gith...)

Hackety Hack (http://hacketyhack.heroku.com/) was talking about a version for the Mac App Store using MacRuby

Our current app will be open-sourced on Github soon...