The Register explains what a netbook is

Hot on the heels of news that Psion seeks to enforce ownership of the word "netbook",  The Register(So, what's the f**king difference between a Netbook and an ultrathin?) presents a useful flowchart which will you whether you are the proud owner of a netbook...or a plain old laptop...or a handheld....or an ultraportable PC...or an ultrathin...

 Now, as a proud owner of a (rather venerable) Sony Vaio nini notebook, an OQO UMPC, a Pocket PC, and a rather large IBM ThinkPad, what I really need is a princely purple PC formerly known as a Netbook..