There's a Starbucks in Washington that has a bicycle powered blender and the customers make their own drinks or something (I couldn't find any information on why they're doing this or which one in WA, but there was a video on Keith Obermann last night). So, here are some resources around the web on bike blenders, seems pretty easy to make a DIY version.

Byerley Bicycle Blender (they sell a bicycle blender) - Link.

Bicycle powered soap blender - Link.

Bike blender for margaritas - Link.

Plans for Pedal-Powered Vegetable Juicycle - Link.
And here's a story about someone making ice cream with a bicycle powered ice cream maker - Link.
































That Starbucks bike blender may look familiar because it is in fact the Byerly Bike Blender. Kudos to him for getting them out in the public eye.
Reply to this comment
The mayor of Phoenix rode one of these at a Starbucks charity event last night. Comical to say the least.
Reply to this comment
A well known bicycle powered blender can be found at the smoothy shop at "the end" of the drive to Hana on Maui, Hawaii. Here's a picture of my wife making our smoothy...
http://www.flickr.com/photos/47159654@N00/177650498/
Reply to this comment
Here's an article about a Starbucks Celebrity Blender Bike-Off Challenge for Charity held Thursday, May 25 at Trump Tower, Manhattan.
http://www.qgazette.com/news/2006/0531/features/030.html
And another mention, also from the Queens (NY) Gazette:
Bunches Of Blenders Bike Across U.S.
It's not a bird, or a plane, or a school of Samba. It's a blender bike! Throughout the summer months, Starbucks will peddle a virtual marathon across the country with a brigade of stationary bikes that when ridden, power an attached blender. Spin classes have nothing on this team of baristas. They'll be "riding in" to various events and community gatherings around the United States, so keep your eyes peeled and don't be afraid to flag down a cool Frappuccino drink. "Starbucks is always looking for ways to surprise and delight our customers, and what better way than to give traditional beverage sampling a new 'spin'-literally," Brad Stevens, vice president of Marketing, said. "Not only are these bikes engaging and entertaining, they really do blend up a tasty drink."
Reply to this comment
What would be great would be some universal-ish attachment for a KitchenAid mixer. Because then you could knead dough, grind meat, whip drinks, etc.
Reply to this comment