I would love to see MMS, but I agree it is a "dead horse".
If I had to pick two, I would like to have video recording and voice dialing support.
There are many more features I would like to see also. Features like camera controls (night mode, white balance, zoom, macro and more MP). A photo light or flash would be nice. A voice record function would be useful. Expanded bluetooth support for object push/file transfer etc. is another.
All of the above features, except the more MP, I am used to from my old phone (SE W810i), but I still get more use out of my iPhone. I don't know how I lived without google maps, and craploads of space for full movies, just to name a few. Plus the wow factor from others when they see you using the iPhone is still pretty cool.
