Interesting concept, but an unauthenticated SMS gateway might not be a good idea. I hope there is throttling and other means of abuse prevention in place.
Is the source code for this available somewhere? I'm curious about how exactly you're sending the text messages, and I can't really tell anything from a quick glance at the binaries included in the zip.
For an example usage, I used it to alert me when a slow program for finding prime numbers had finished.