Hey Mate,
There's a few different options around these days, as every manufacturer is releasing "NetBooks".
The Sony above has some pretty poor specs - slower processer and the fact that it runs Vista means it will run slower again.
The HP isn't bad, i've sold a couple of these to clients who love them. Personally my favourite is the Asus EEE PC. They're awesome little notebooks with amazing (7+hours) battery life.
http://au.asus.com/products.aspx?l1=...92&modelmenu=1
If you want any more info give me a shout.