The first episode of the new season of Things by Bre Pettis shows how to count binary on your fingers:

Be the alpha-geek at the next nerdfest! Show you can count on your fingers in binary! With a little practice you’ll be able to impress everyone! Eric Skiff breaks it on down and Kellbot has a cameo providing a public service announcement.

Also check out the Web's oldest binary finger counting tutorial and a Digg search for "counting binary fingers".

Source: Bre Pettis Blog

Bre Pettis needed to prototype his Cherrytron 2000 robotic arm that he's making for Roboexotica, so he teamed up with Eric Skiff to make one. Adam Cecchetti also had a hand in the original design work.

To learn more about the popsicle stick robotic arm, get the design files, and to vote on the popsicle stick aesthetic vs. acrylic parts, visit Bre's blog.

Source: Bre Pettis and Vimeo