Tomorrow, I'll be getting the EeePC 1005HA that I mentioned earlier, my wife told me to just buy it already. It will be replacing my P3 933mhz laptop.
It will be my only mobile computer. It's mobility will be far better than that of my laptop primarily because of the stellar battery life (9 hours as opposed to 10 minutes). It obviously will out-perform the laptop in general computing. It won't choke on YouTube and Hulu videos, thanks to a wimpy but up-to-date and fully supported graphics accelerator.
Finally, it was $279.99 shipped from NewEgg.
Unless you must have a large screen or want to play Modern Warfare 2 on-the-go, I don't see why you would not be happy with a netbook.