This is very cool, congratulations! Just bought a sample pack. I have a few technical questions, if I may (or if you have a good blog post or document that can help, that would be amazing.)

I've been playing with RFID for a while. Is NFC different than RFID? On a different frequency than 132 KHz/13.56 MHz that I already have readers for?

Also, are there simple readers or breakout boards I can use to play with this (a la Parallax's RFID reader, or anything that could plug into my Arduino?) as opposed to buying a phone? Any suggestions for good readers or what the protocol looks like?

Also, out of curiosity (see, I'm a software guy, so often this stuff is a black box to me) did you all design and fab the tags yourselves? Or do you get them in bulk and then do your own customizations?

This is extremely cool stuff! I'm really excited about playing around with this!