IFTTT + Cloudmailin + Tropo = AutoSMS-Sender: Never forget any birthday!
Set up a GCal-Event with a keyword, the mobile number and name. IFTTT forwards these information to a cloudmailin e-mail address that calls a Tropo script to send a SMS to the given number and your defined text (incl. variable name = Addin from gCal at IFTT). The Tropo script even forwards incoming SMS to a pre-set e-mail-adress.