Adding gmail contacts in ichat for me.com account
If you create a me.com account in iChat, this will serve as an AIM account. If you want to add your Google Talk/Google+ friends with Gmail addresses, then you will have to add a Google account in iChat. This is very simple to do in Lion, simply go to iChat>Preferences, click on Accounts, and hit the small + button in the bottom left. Then you will be prompted to add new account information and just select the option from the popup box called Google Talk. Then all you need to do is enter your Google account information and you will now have all your Google friends in iChat.