Well I just chatted with an AT&T rep trying to get MMS working for a different phone (not my iphone but on the same line). The woman wouldn't do anything other than repeat the drivel they tell them to. "You cannot send an MMS message even using the RAZR like you want because you are on an iPhone line" Even though I have an unlimited messaging plan that includes MMS. It won't work on my iPhone, my RAZR, or my G1 and I'm trying to solve it but anyway more to the point of this topic. I told her I was paying for the service and the iPhone supports it so I should be able to use it and she said that it doesn't support MMS until late summer. This may not sound like much but it is more than the late 2009 Apple told us at WWDC. Hope this helps someone and I'm open to MMS suggestions 
Heres a pic of the end of the convo, note my text is red and the rep's is black.
Heres a pic of the end of the convo, note my text is red and the rep's is black.