I have the Asus EeePC 900, (1GB Ram, 1MHz, WinXP)
it can run my A6 games and editors fine.

The framerate is also quite good, but
I have not tested if shaders work.

-> its a good practise to optimize the
framerate in a game, to test on a low end system.

The Netbooks have sufficient power to run
casual 3D (that should be created with focus on
FPS efficiency). But I suggest to
put an external keyboard + mouse into your suitcase
if you want to work in your hotelroom
without getting frustrated.

But If you need to "seriously" develop while travelling,
it might be better to get a bigger laptop instead.