I would get one of the smallest models I could. I'd also make sure it runs linux. use desktops for power that's what they are good at, notebooks should be portable, meaning comfortable to carry around in a bag for a while. Light as you can get.
About the only thing I would invest in is at least 1G of ram, maybe even 2G. laptops tend to ship with slower hard drives so if you start swapping you are really going to have problems. maybe benchmark your average ram usage on the desktop.
I've found that processor speed isn't as important as most people think, go light you'll be fine, this isn't a server.
last note. I regret buying a desktop replacement laptop.
edit: when I say make sure it runs linux I mean make sure that it's hardware is compatible with a linux install. That same hardware will work good with windows, and gives you freedom of choice later. Or you can just get linux now because linux rules.
Light as you can get AND linux friendly: that's exactly what I was looking for.
I am now the very happy owner of a sub-2 pounds, Ubuntu certified, 12.1" laptop for 6 month, and that the best notebook choice I ever made.
Right choice for me, but I am only on the road 5 to 6 days a month, so your mileage may vary if you are really a nomad worker.
About the only thing I would invest in is at least 1G of ram, maybe even 2G. laptops tend to ship with slower hard drives so if you start swapping you are really going to have problems. maybe benchmark your average ram usage on the desktop.
I've found that processor speed isn't as important as most people think, go light you'll be fine, this isn't a server.
last note. I regret buying a desktop replacement laptop.
edit: when I say make sure it runs linux I mean make sure that it's hardware is compatible with a linux install. That same hardware will work good with windows, and gives you freedom of choice later. Or you can just get linux now because linux rules.