It seems to be a "an App Engine app that generates customized printable envelopes with the map to your recipient on them". Here's the developer's blog post abo

It seems to be a "an App Engine app that generates customized printable envelopes with the map to your recipient on them". Here's the developer's blog post about it: http://bit.ly/sVgTGh http://bit.ly/sVgTGh