Looked at the vids and the such, and the SMS feature on the iPhone looks very much like iChat. I will admit that I have only had a few SMS messages from someone that I knew that had my phone number. Never sent one (was not on a SMS plan - so I wanted to avoid extra charges). I have done "tons" of IM's to iChat/AIM and YIM via my iMac or my PB/MacBook. So just how does SMS work with my "buddies" on iChat/AIM and YIM? Do I need to get their phone numbers? Or will their ID's on each service work? Anyone know?