Apple won't do netbooks
At least, not as netbooks are seen in the Windows space. While this is a growth area for the industry, it is not a profitable area. The margins are very small, the hardware (at least the three I played with) seems cheap and lacking in durability, and the screens and keyboards are small enough that usability is an issue. That seems to be outside Apple's game plan. Netbooks' biggest charm is that they are cheap, but only in their upfront cost.
Apple's ultraportable is the Macbook Air, which is a nice piece of kit.
IT? because I don't get IT when it comes to netbooks ...