The long and short of it is that I'm just not convinced about the software. Yes, I know that I can run Windows XP or Vista on it, but I'll have to purchase a new license, and that will drive up the costs.
I like the idea of this form factor. But I'm just not sure about the software. My main use for a Treo and a keyboard, or the Foleo, was the ability to use DataViz Documents To Go for notes and document creation and editing. If I had Windows and Office (another license I'll need to buy, further driving up the cost of a Eee PC) I could do all of the same tasks as a Treo and keyboard or the Foleo.
I guess it all really comes down to personal choice.