I didn't think of the RS232 as my autoguiding is currently controlled through a serial port on the mount, but if I ever get a gemini for the losmandy I would need something for that.
Hmm, LPT, I can see me quickly running out of edges on the laptop to put things
I don't use battery much atm, though that is definately something to think of.
Good brightness and contrast controls is something I didn't think of. Even though I curse this laptop all the time for not having contrast controls (I do use adobe gamma though which is something I guess).
I'd like a good wide screen as I will probably do a fair bit of processing on it as well. Unless I lash out and get myself a decent CRT for my desktop.