In my opinion, netbooks are horrible abominations - cheaper, more portable, but an efficiency bomb. A laptop already is portable - anything less still requires a bag, still takes up space, and the performance drop isn't worth it (Atom? Tolerable. 75% scaling of a QWERTY keyboard? That's more than distasteful).
Unless you're scripting UI's, netbooks are too incompetent to handle any task, menial as it may be, aside from browsing (for a while) or checking your email occasionally. Otherwise, it's good to mess around on a new OS with one, but don't expect to try out any graphical features, and prepare for desktop space management woes.