Gabor pointed me to this today - a site exclusively devoted to cool things you can do with duct tape. I personally liked the duct tape wallet.
It's so nerdy that its almost (note the use of the world almost) cool. Goes to show you a couple of things
1. You can do the same things with different materials and styles and get great results
2. Opening your eyes and being resourceful is a pretty rewarding experience - I like the way this guy publishes the instructions for free and its now being used by Youth programmes
Just don't make the Marvin the Martian outfit please...