Laptops are time wasters: Firstly, I agree with Vladan - you don't need a laptop, just a hard drive. I carry a 6.4 gb IDE, cable & screw driver in my briefcase. It weighs much less than a laptop, is much smaller, and costs less than $200. My drive is NTFS, compressed. It contains 4 gb of s/w masters/installers and the remainder is used for client backup etc.
There is always an NT box wherever I go that has a spare IDE port.
Secondly, laptops waste time, especially if you are in a support role. The damn things are lobotomised in order to make them small. The result is that each and every install of NT requires manufacturer provided drivers, patches etc. Rarely can you use a plain vanilla install of an OS. I can build two or three desktops in the time it takes to do 1 laptop.
Cheers