If you're an app developer yourself or if you're interested in a more technical description of Timebox, I wrote a post on Ray Wenderlich's Tutorials for iOS Developers site:
http://www.raywenderlich.com/forums/viewtopic.php?f=4&t=9677
It also includes a little peek inside Timebox, describing some of the technology that we used to build the Timebox app.
Thanks,
Len