Ya know my feelings... NC20 or if you can stretch then I'd consider the Toshiba R500 Portege...
Had 6 turn up here the other day and they are light as a feather!! Things are so so so lush.
Just under 1KG so less than a bag of sugar... 7 - 8 hours battery life apparently as well as a core 2 duo. Optical drive too if I remember correctly.
For myself though after hours and hours of research, I'm going with the NC20 for the price and size. Like you I want a decent res but also wanna keep the weight down along with the price. The girlfriend is happy with this one too so she wont take any convincing.
That said... I so very nearly pulled the trigger on an NC10 earlier as they were £259 on Viking with a 20% off voucher and 7% quidco along with a 800g bag of biscuits thrown in for free. Think total would have been like £222. Missed out by about 20 mins on the deal though
Edit: Ps. Just looking at price of NC20 again and look at the lil icons below the netbook: Linky