I was wondering if anyone knew about a SD RFID card that could be programmed by software on the Treo itself. I'd like to duplicate the RFID tags I have to carry around for work (door cards, key dongles, I have 3 total) and store them all on one SD card.

It'd be even better if I could program it on demand, so I would have to enter a PIN to enable the RFID tag use.

I'd rather not have to cut up the cards and tape the tags to the phone if I can avoid it, heh.