I posted Sunday about the RFID tags at TechEd. I still have no idea what or where they were planning on using them at. I will try to find out for those that are interested.
UPDATE!!! - At the keynote this morning we found out what the RFID tags are for. Microsoft is using them to track where people are throughout the conference. They are 100% anonymous. Most people have either thrown them away, but at this mornings keynote they gave away 5 creative portal media players (if I am not mistaken). It was a RFID raffle. You became eligible when you talked in the door with your RFID tag.