I recently prototyped out a project that I thought was the coolest thing, a RFID Door Lock. I saw a cool instructable that shows you how to build a RFID powered door lock utilizing an Atmel AVR chip with the ever so popular Arduino firmware all for under $50!! Basically the microcontroller sends a signal to an electric door strike to open the door if the RFID card matches what is programmed into the memory. There is a master card that is used to program other RFID cards, you just swipe the master the led flashes to state it is in programming mode and then you swipe the new RFID tag and voila, it’s saved to the chips memory. A totally cool project, I invite you to check it out here.. Stay tuned for pics!