When one registered online (which iirc we intend to let people do at this FUDCon), the webpage itself generated a nice bar code included badge. One printed it out, and wore it/carried it etc. Only people who had on venue registrations got badges there, the rest already had them.
I was thinking of this: http://www.flickr.com/photos/susmit_s/5409333231/sizes/l/in/set-721576259588...
You have a booth, people checkin and pick up their registrations and the goodies. The organisers get a chance to welcome everyone, everything is nice and friendly. :)
Asking people to print their own registrations is ok, but I am bit uncomfortable about it.
The organisers, of course, may decide to do whatever is best.
Thanks.