Screen rotation in Gutsy 7.10

[Loïc Martin]

Hi,
I'd like to know how I can set up an automatic (or non-automatic) screen 
rotation when I rotate my LCD from landscape to portrait.

The LCD's documentation says it can be automatic on Windows XP and 
Vista, so the screen must be passing an information to the computer.

Is there any way to achieve the same in linux, or is there any way to 
rotate the resolution manually? I've checked the new Screen 
configuration in Gutsy (I had high hopes for it :) ), but there's 
nothing about rotation.

Thank you,
Loïc