Heyas,
Until Apple decides to relax the iPhone operating system, a lot of applications are going to be gimped, because you can't upload data or access the file system.
The one thing APDL had going for it is that you could upload your schedule, making the data entry thing a no-brainer. I also liked the Whitlow and 24/7 checking.
Heck, on my old iPod Mini, you could drag and drop files and basically use the thing like a portable hard drive. This, IMHO, is the biggest drawback to the iPhone.
Nu