Watch out with the end-of-line NC10 bargains from the likes of Comet, Argos etc. These machines have a 3 cell, rather than the normal 6 cell, battery and consequently have shorter battery life (albeit still as good as many other netbooks). The current Samsung range is N110 (replaces NC10), N120 (wider with bigger keyboard but same size screen), N310 and the NC20 (bigger screen and different processor). They've also announced a N130, N140, N510 so it's best to check on the current specs and prices first.
-- from my N110.