HI Cd,
So this is relatively new problem then ?
In that case delete the file com.apple.ichat.AIM.plist from Users/(your account)/Library/Preferences.
Restart iChat. This will ask you again to fill in the accoun t details but will cure any problems with changes to your Address Book where the "Real" name you use in iChat does not match the Mac User account's Address Book Me card.
12:41 PM Saturday; April 15, 2006