At some point I had the idea for an RFID bracelet. Ideally, it would be targeted to trade shows. I went to one previously the best tech they had was these cards that you had to go and manually scan at each booth.

Anyhow, the idea was that each bracelet would have an RFID card, and an RFID reader. When you shook hands with someone, it would read their ID #. So, you're not only physically meeting someone, but logging them as someone you met. When you got back to your hotel that night, you plug it into your computer and it pulls up everyone's bio (picture, name, company, email address, etc).

with what?