Well I had tried many tablets pcs and convertibles and I was so turned off by them that I thought to give it atleast two years for me to try it out again. I bought a lenovo T61 instead...which I am extremely happy with.
I think tablets will be good when they can come as thin as the toshiba protege R-something, 0.7 inches thin....and when they are also very light (2lbs or less) while being quite powerful, have a nice bright 14.1" screen, etc with good battery life. i don't see all that happening for atleast two years that's why i don't want to waste time looking for one now. But when it does, you will have a tablet convertible laptop that will feel as light and thin as a regular legal pad (almost) when you are writing on it....and that's the main thing I think.
I think i am leaning more towards the digital pad rather than the pen, simply because I would be carrying a portoflio just like I do now with any kind of paper I want in it and it will convert my digital notes for me without me having to lug around a special sensor/adapter and pen for the process (because that would be the only other way to not have to get specialized paper involved)