SmsScheduler from intellibits is an application that allows BlackBerry users prepare SMS messages in advance and schedule them for automatic delivery at any date & time in the future. These could include messages with wishes, reminders for colleagues and friends, etc.

Various types of recurrence (e.g. daily, weekly, monthly and yearly) are supported. So a user can schedule a Happy Birthday message to be sent all years on a particular date, for example.

The software supports the scheduling of an unlimited number SMS messages and allows users to specify multiple recipient numbers for each scheduled SMS, according to intellibits. Recipient mobile numbers are chosen from the BlackBerry's Address Book.

In addition, all delivered messages are logged and listed through a Log screen

SmsScheduler goes for $4.99. You can learn more about it here.