I wrote a program that saves off all the texts -- it's a SQLite database, IIRC. I forget the program it was based on, but the idea was that if you lost or someone stole your iPhone, you could get it to post its location via twitter based on a URL...actually, now that I think about it, there are probably hundreds of apps that can do so, including some sort of backup program. Or there's probably a hack to get at them, something like this (except texts instead of notes), perhaps?