"Textr is a program for Windows Mobile 5 & 6 devices which organizes SMS Text Messages into easy to read conversations. "
In Jon's Stable of Devices, a Treo 750v lives. And I HATE the threaded SMS app in it! I'd much rather have regular old SMS integrated into messaging. However, if you like Threaded SMS (And it's a free world, so you're able to express it), Textr looks like a nice program that can turn your boring old functional SMS messaging into threaded conversations. And it lets you back them up, which is a nice feature.