Note: Marco Polo has been sold to Libera Inc. and I will no longer be developing the Marco Polo app. I'm very excited to see what they will do with it! (2 May 2013.)
Original post (16 June 2011) follows:
Version 0.1 was released on 2011/07/01. Download it now from the Android market!
Need help getting started? Check out the help and FAQ page.
The app is still in beta, and eventually will incorporate a points system and a way to play "Marco Polo" by sending location-tagged messages back and forth through the app. Please send feedback!
If you like the app but don't want ads, try Marco Polo Premium! (Coming soon...)