I've seen rumours of an imminent Dell Mini 12, which if it's priced right could be interesting.
My main problem with the current crop is the low res screens, typically 1024x600 if you're lucky. Hardly usable, got more pixels on my mobile phone!
I think it's M$ (and Intel with the hardware?) restricting the spec of the netbooks by only offering discounted XP licenses if they conform to a certain spec. Hence some (e.g. HP Mini 2133), are having to bundle Vista with them if they deviate from the agreed spec, bumping up the price. Vista on one of these things must be like trying to give Jo Brand a piggy back. Not a pretty sight.
So whilst I'm tempted, I think the 12" ones offering 1280x800 are the minimum I could live with, though I suppose the HP (same resolution on a 8.9" screen!) could be upgraded to XP or a linux derivative quite easily if you need the portability and cuteness.