People wrote messages to Uber Tuber on Uber Tuber postcards. They were made to be mailed back to me, (or to my parent's address actually), but before that they were archived, and you can see them here:
http://picasaweb.google.com
and here's the Uber Tuber display:
http://picasaweb.google.com
Kudos to everyone who made this show happen. And to all those potato fans from Australia!