I'm quite excited about this. As a long time user of PIMs (Palm for example) I know the usefullness of such. This looks to be a great idea.
However, there is two possible strikes that may steer me away from this:
Batteries: What sort of batteries does this take? Li-on? Hardwired into the machine so you have to buy a whole new machine when the batteries die? AA/9 volt etc? If they're hardwired, then I won't buy it. I have yet to buy any device, that has hardwired batteries
and that includes the Ipod.
Vista: If this won't run without vista, then that too will stop me. Vista's use of DRM has assured that I won't buy anymore MS based OS from them again. I'm switching to linux as soon as possible.