Size matters when it comes to netbooks. See the picture of my last 3 generations of laptop, notebook, netbook bags. The netbook is almost completely sunken in the small cross body bag right of the apple. No, not what you might think. I put the apple there for size comparison.
I always had a desktop and none of the laptops ever completely replaced it. But being in a meeting, at a conference or just on the road, the netbook is my choice.