Is it the price, or the size/weight leaning you towards a netbook?
Really.. the current crop, even the dual core atoms and the such, are inadequate for LR or CS5. They might be okay for a viewer of some type, but they're just irritating to use imo..
If its the size/weight.. how about a 2.5 pound i7 mobile (dual core) with a 1440x900 12 inch matte screen driven by a HD Intel video chip, carbon fiber reinforced plastic, 8gbs or RAM, a fast 256gb SSD, BT, A/G/B/N wifi, full size Thinkpad keyboard/pointer/touchpad, runs 8 hours on a 6 cell battery (total of 2.7 pounds), and is MILSPEC for dust/water/shock? Even has 3 USB ports and an SD card reader.
This little gem has become my new best friend over the last few months and it's plenty powerful for on the road editing in CS5 or LR..
Sorry to be so verbose, but I'm still in the honeymoon phase..