To go with the other post, I've made threaded versions of the cabs posted a few pages back. I've also found settings for AT&T for MMS, so I've made an AT&T cab as well, though I don't know if it works or not. Doubt there are any AT&T people using MightyROM, but maybe someone is and will find the CAB useful. So, here are the threaded versions.
Click Here if you want a non-threaded version.