If you check out ANN's thread about the Ipad App, Ed Chavez from Vertical steps in and explains the
difficulties involved with
getting digital releases on multiple devices - every device has it's own coding / programming / delivery system [so you can't just plunk in your high - res PDF for your
print edition], which can sometimes be time consuming or restrictive depending on their policites [the Playstation Network one was rather icky by the sounds of it - they only want chapters, not full books, and they want the comics cut up
into a panel by panel slideshow].