Hi,
You can but not with an @me.com name.
This page allows you to Register a @mac.com name.
It is not an Email account (although it looks like one)
You could also register for a AIM name.
@mac.com used to be the Email/ID from the .Mac service that was a forerunner to MobileMe and this did and does allow you to use Lapsed and Trial Accounts with iChat.
7:17 PM Sunday; November 29, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"