I'm curious on the [Near field communication, NFC](http://en.wikipedia.org/wiki/Near_field_communication) that the Google Nexus S has. From what I understand, this techonlogy can be used to read RFID-tags, or am I wrong about that?

What can I read with an NFC enabled Google Nexus S? Can I read all RFID-tags? can I read something else than RFID-tags?