JBL11183
Lurker
You can enable MMS and Tethering using the Mobile Configs here, apparently:
http://help.benm.at/help.php
Did you try it yet? I had the 3G and updated it to 3.0. I got my sister the 3GS because she was still using the 2G. I ended up just getting the 3GS after playing with the video camera. So far the only difference beside the camera, the compass and voice control(I'm sure there are more) is that the 3GS is alot faster in all aspects of the phone.