This is awesome, will play with it when I get a chance.

As an aside, I've begun to think that email is/should become a platform for app development. Some sites are already using incoming email for active user engagement (posterous, idonethis, etc)

I think it's a great avenue to fight app/user fatigue. Most people constantly check their email no matter what, but few are making it past the app download to regular usage. The assumptions of emails limitations should be rethought.