Your right. But it's very easy to carry around a to/do list, piece of paper in your pocket and keep an eye on things. Never failed me. The drop rate of SMS's is 2% or so on the other hand(not to mention dead batteries, lack of coverage, silent ringers, etc.). I've also seen many businessmen at the top of their fields using paper: a very simple, reliable and effective method.

I'm not saying this is a bad idea. It's definitely something useful. I just think it's not a great business idea. I think you have demonstrated great abilities, and you could put those to work on harder, more profitable problems.