Lonoda LTD has txtot – sms reminder (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $1.99) for a limited time.

Now you can schedule a simple text message such as Happy Birthday or I Love You to your loved ones, making sure that special events are never missed. All you need to do is pick a name from your contacts , select a date and a time , and write your message. txtot reminds you to send text messages on a specified time. It DOES NOT send it for you automatically.