One of the lesser mentioned features of the new MMS functionality recently activated by AT&T on the iPhone is the ability to send Voice Memos.  As the attached image shows, when you click on the “Share” button, you are given the option to choose to send memo via MMS.

This may not seem like a big deal, but it adds a bit of personality and emotion to a message that wouldn’t be possible with a simple text message.  It might be a much faster way to send message, rather than typing one out.  Nice feature!