The only laptop that fits the bill is the OLPC XO. The XO-1 is 18 years old...

and yes I did work outside a few times, with rdesktop

I still use my XO-1 for work I can do with a console (via SSH with vi, tmux, etc).

Alas, a web browser is kinda required for modern dev work, and an 18 year old machine with 128 MB of ram doesn't cut it. rdesktop, x forwarding, vnc, etc are all too slow.

I considered removing the screen and trying to transplant it to a modern machine, but it looks like many months work to rebuild the electrical interfaces and custom pixel layouts etc.

There's a small DIY community who take XO-1 displays and installs them in old ThinkPads. It may not be as challenging as it first appears.

oooh - any links?