Send SMS baby, I am busy!

I believe that great potential of smartphones / Pocket PC phones is not in some side functions like editing Word files, but rather in helping user to better manage his communication. Call Assistant is a good representative of this category. If you turn it on, it will send predefined SMSs, saying probably "I am on meeting now, try at 7". And you can bet that it will do the smart way, so to send message only to some persons and not more than once to the same person. Oh, yeah, it is even free.