From now ( 1/11/2008) wireless doesnt work out of the box.
To solve this issue:
First, disable closed source drivers:
System > Administration > Hardware Drivers: Desactivate Support for Atheros 802.11 wireless Lan cards
Then in terminal
sudo apt-get install linux-backports-modules-2.6.27-7-generic
(complete with tab with smth ending with generic to select the good kernel if the package doesnt exist)
Reboot, and voilà!
You can also get a better experience with Hotkey, webcam and sound working by installing the custom kernel, especially deseigned for Epc: