I came across this site the other day: www.thebetacup.com
58 billion paper cups are thrown away - and are not recycled - every year. The Betacup's goal is find the best ideas to eliminate paper cup consumption and asks all of you to get involved.
They are currently running a contest with the submission deadline being the 1st of June 2010.
Here are some of the ideas so far:
I would have thought the popular keepcup would have featured.