i basically just check facebook and macrumors so its not like i need something super fast or anything. i currently have a dell desktop with a pentium 4 1 gig ram and a 80 gig hard drive. it has windows seven which surprisingly runs really well considering its at least five years old. so a netbook with an atom would be a step up.
Based on that post, netbook + linux seems the best solution to me.
everyday in my M$ world as I used to take the hackintosh on the train to work. However in the end it was just too unreliable with frequent 'kernel panics' and boot problems. So I purchased a new shiny MBP 13" to take on the train instead