[GuyWithNoLife]

I had this problem once with my 6700... don't remember which ROM I was running at the time, but i was using the stock MMS program. My friend and I both thought it was something with his phone (razr on Cingular at the time) until I noticed I had the txt message sitting in the Outbox folder. It would randomly resend him the message but not remove the txt from that folder.

Hope this helps.