Morning Kaz, I got up earlier than Simon expected.
I can only comment on the Samsung NC10, as I haven't tried another. Construction quality feels good, it's finished in piano black. Screen quality is excellent - it beats my notebook by a long way. Battery life seems to be about 6.5 hours. It has wireless, ethernet and Bluetooth built in. As I don't often use ethernet or BT, I've disabled them in device manager, and it looks like that may give me an extra 10% on battery life.
The NC10 ships with XP Home SP3, a raft of Samsung utilities and McAfee AV (90 days). I recommend removing the latter asap. I had to get about 31 updates from MS. On first running the machine, it will create a restore partition to 'factory state' and will, periodically suggest you back up the C drive to an external drive - a bit like Acronis True Image. During that initial creation, it allows you to partition the drive to C & D, suggesting a 70/70 split of the space remaining once the recovery partition is created.
It's very good at acquiring and holding a wireless connection, and is pretty quiet in operation. I do recommend an upgrade to 2GB RAM, which will cost you £15-20. The upgrade process is a five minute job.
The only fault I find with the machine is the touchpad, which is small and fiddly - but I prefer to use a mouse anyway.
You can use function keys to turn off wireless to save battery, to turn off the backlight and to alter brightness and volume. There's also a key to change mode (silent/normal/max performance) and another to run the Samsung diagnostics.
Highly recommended. (It comes with a case, btw, which isn't mentioned in any of the specs I've seen, so don't buy one.