SMS Commander
I have persuaded RobbieDuncan on MacRumors to give me the source code for a program called SMS Commander, which should allow you to transfer SMS messages from your phone to your computer, my phone can only store 100 or so text messages and I regularly have to clear them off which is annoying and I have frequently bitched about it, hopefully this will allow you to keep your SMS messages in the same way that you can keep emails.
The code itself is written in Objective-C/Cocoa.
Currently I have been trying to get it to compile, but it seems to throw up errors that I cannot figure out, if anyone else wants the source code send me an email to matthew@matthewhutton.com.