I did a search and didn't come up with anything, so I am hoping this is new to everyone. There is now a SMS Scheduling program from a site called Intellibits (I didn't make the application, I just found it with google). The program allows the user to schedule sms to be sent at a later time. You can also set it up to repeat the message and send time. There isn't a trial as far as I know, but it only costs $4.99. So far I have tried it by sending myself a text and it works great. After you pay you are directed to a page that includes a zip and OTA. Here is a link for everyone.

Intellibits: software for BlackBerry, Symbian, Apple iPhone and Windows Mobile