I am inspired.
It's sad - One of the teeny-bopper social networking tools has actually piqued my interest, and now I'm inspired.
Truth be told, my inspiration comes from Fuelfrog.
I make use of a time tracking tool called Toggl. I can specify projects, tasks within a project, then run a timer against a single task. This helps me at work, when my time is chargable to different cost codes depending on the task that I do. My biggest beef with it is that I can't do it from my BB.
But with Twitter, I have an excellent, and cheap, interface to issue simple "start" and "stop" commands, and even provide some data (such as a project code or something).
Or if time tracking isn't your thing, maybe an improved version of Fuelfrog? Message the odometer reading, price and litres, and you get a tool that is a bit more able than what Fuelfrog is right now (though its still an excellent tool).
Or.. Maybe I want to track what days I ride to work - "@user ride both", and have it drop into a calendar.
The possibilities are endless. SMS has always been a great cheap way to send simple messages or commands, but without having an SMS gateway (I think thats what its called) using it has been a problem.
But with Twitter, all that's provided - and its free.