Yep, I've got a little 12" laptop - the size/weight of a netbook but more powerful. So it's ideal for using on the move but powerful enough to do most things. I don't use it much in the house, only when I'm away - so being light was the main requirement.
The downside of these devices is that they cost a little more than a laptop with a bigger screen, so unless you need the portability then I'd go for a standard laptop.
With hindsight, I'd have spent a little more than I did (mine was around £350 IIRC) and bought a laptop with an SSD - as the slow 4200RPM drive does bog it down. I may upgrade to an SSD at a later date as prices are dropping fast (about £60 for a 64GB SSD).
If you let us know a little big about how it's going to be used we may be able to recommend one
. Do you need it to be very light and portable or is it not going to be used out of the house? Is there going to be any moderate gaming played on it? How much storage do you need (as this may rule out an SSD)>