I'd keep an eye on fusion netbooks.
As for dual core CULV machines, I can vouch for them. They do the job, and they can do it all day.
Not sure about that particular one, but the best in battery life are still the Acer 3810T and the Asus UL30A.
Again, fusion netbooks are worth keeping in mind. they are smaller, and have good balance between CPU and PSU. Not necessary cheaper though.
Atom based netbooks are really crappy, even those with dual-core compared to a Laptop with a celeron proc... ^^
There were a good deal when the laptops were really more expensive. But as the CULV really cute down the price, battery life is much better than before and their mostly lighweight now...
Atom based Netbooks and CULV Laptops are pretty close in term of price, unless you get a real low-cost one, and you're really short with your money...
EDIT : if by fusion netbooks you mean AMD, I can't tell then as I don't have any experiences with AMD Netbooks. With laptops or Desktops, AMD proc are good in term of performance but not that good with battery life.
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