And for the PIC fans (like myself), here is a project which shows how to interface a GSM module to the PIC16F877 and accept incoming SMS from your cellphone.
The main component of the GSM Notice board is PIC16F877A, received message is displayed on the LCD display which will update automatically when next SMS is received, it has audio indicator to inform that SMS is received. This is an intelligent noticeboard intended as electronics engineering projects for final year students.