Regarding the AIM thing, Joel, the Apple notification service doesn't start until September: http://www.engadget.com/2008/06/09/iphone-push-notification-service-for-devs-announced/

sweet

This will go nicely with my crutches/pogo stick combo!

They appear to have several hand powered models, so perhaps they got requests for this one. I imagine it's largely about the gearing.