October 19, 2008 
I think this is one of the coolest ideas that I have seen in a long time. Attaching a desk to a treadmill and walking while you work. It has lots of benefits including losing weight. I also agree with a comment from one company doing it that it would help people think differently.
The company featured on CNN has treadmills that go up to 2 miles per hour and even has a conference room with treadmills around the table.
In doing some research on the topic, I found the following:
- A blog on building your own treadmill desk
- A site to buy a treadmill workstation
- An original article on this from 2005 and some Mayo Clinic research
- A post on The Healthcare Blog about it
Enabling Healthy Decisions 
These are great but at $5,000 too expensive for most of us. There are some great alternative treadmill desks out there however. One that I found that I like quite a bit is the TrekDesk at http://www.trekdesk.com.