I have a netbook, and it is a great accessory to my desktop. It allows me to have a few productive tricks up my sleeve when I am out and about. I can edit documents, browse the web, play a few little games, record audio, etc. But it cannot do anything major like editing audio/video, watching HD anything, and it is far too small to do any serious multi-tasking.
I looked into a tablet to replace it, but then realized the only good ones are in the $500+ dollar range (compare to the $280 netbook), gets less battery life, cannot handle any normal x86 programs, and all that really works well on it are plants vs zombies and angry birds... while fun, they are not worth sinking $500+ into a device that plays 2 games, and some internet access.
What I really want is a phone sized device that houses my user profile, software, and some documents which can take over whatever device I plug into. On the go it would be a smart phone, then when I come home I would plug it into my TV to watch movies, when I go to work I plug it into my PC and am able to take advantage of that hardware, when at church have it drive the multimedia for the projector, when working on a vieo project have it take over the server/editor in the basement. One personal device that has my interface on several devices. May use cloud tech for file storage, but all of my personal information stays local. Give me that machine and I will go into debt for it.