Hey! I use the calendar on my Palm regularly!
That being said, a "OneNote Appliance" would be of some interest to me, indeed. A dedicated device that basically ran OneNote, or some similar application, and was portable enough (I still can't get over 2.5 pounds

), and could then sync those note files over to my PC would be a great deal of use in meetings and planning sessions.
I'm expecting to get a Tablet through work in the near future, and I plan to make use of OneNote on that for exactly that purpose. If it works out half as well as as I hope, I'll be pretty pleased with it. Putting just that functionality into the Foleo would get my attention.
Except .... One of the strengths of OneNote is the ability to pull bits and pieces from
other apps into one place for reference and manipulation. I don't guess you could get that in a dedicated device.