This little tidbit is for those of us whom receive a large volume of text messages daily, and are tired of it taking two taps (or a swipe and a tap) on each of our messages to delete, when we just want to nuke every message in there. It's actually quite simplistic, so if you're one of those who need this functionality you can grab it from:
http://www.utternerd.org/Delete+all+SMS+Text+Messages+off+your+iPhone+at+once
http://www.utternerd.org/Delete+all+SMS+Text+Messages+off+your+iPhone+at+once