since you have a desktop, get decent average laptop(dual core, 2gb ram, big HDD, internal cd/dvd-rw-unless you don't mind lugging an external one, wireless card, and comfy keyboard).I tried coding in eeepc 7" screen and it didn't get me far. I used 12" asus ultraportable running linux for years and they are good and has pretty solid build. Unless you're getting a linux certified one or buying from a linux-laptop vendor, chances are some features won't work. I just recently switched to 17" mbp because my coding activity has demanded it (more horsepower and screen real estate), but keeping my 12" for fun hacking and cracking. Both lappies has one thing that's very important for coders: NICE keyboard. That being said, choosing a personal laptop is like choosing a GF/BF: it's personal, only you know your coding habit and which feature is the most important for you.