IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
I own an HP mini netbook, and it is now my primary computer. I take it everywhere, as it is a lot easier to carry around than a laptop. Of course, I ditched Windows within a few hours of buying it, and switched to Linux. While I can boot seven distributions of Linux between the internal drive and external drive, I primarily use openSUSE 12.1 with the Plasma Netbook Workspace. When I want to watch a move, I just connect it to my TV, run the move in its workspace, and continue to work on the netbook.
I also have a rooted Nook Color tablet, and have looked at getting another tablet. The problem is that tablets do not have the internal storage that I need, and do not have enough USB ports. I definitely would not get one that did not have a docking station and external keyboard. Typing on a tablet is just too slow. So far, I have not found a tablet that can replace what I do on my netbook. I have not found a laptop that is easy to carry around as a netbook. I no longer own a desktop, and rarely use my laptop.
Too big to be pocket portable and too small to be comfortable for heavy use. I think the big problem for netbooks is tablets, as jimlynch noted, especially with the keyboard/hardcase options that are available. Netbooks and tablets fill many of the same needs, and with the keyboard/hardcase for the tablet, I can't think of many advantages for the netbook. Another problem has been definitional; exactly what is a netbook? An underpowered, small laptop that may cost as much as a tablet or larger, more powerful laptop is what it means to me. Still a netbook can do most of what consumers use their computers for (kitten photos, anyone?), and the keyboard can be an advantage over a tablet. In the end, I don't think netbooks will be a big seller in the future unless cost comes down and power goes up.