I have the Dell mini 9 which is under 200 quid from Tesco's. I am really happy with it but you do need to know what you are getting. It is Linux based which is good for system resources but not good if you are reliant on windows software. You will generally want to be a little more than point and shoot savvy. But in saying that it does all the required jobs (I have connected a Mobile broadband dongle to it reasonably simply). It only has an 8 GB hard drive but I have plenty of large capacity SD cards.
The Samsung NC10 is from all accounts a nice piece of kit. Good battery life and Hard Disk size. I chose the Dell due to being 100 quid cheaper and I wanted an as compact as possible model.