I began experimenting with a standing or treadmill desk last summer and have finally gotten around to making the full conversion. Here's how I did it, if I can you can do it too.
Step 1: Procure Treadmill and Desk
I found the treadmill cheap on Craigslist. It's not important what kind of treadmill you choose but it makes your life easier if the hand rails are simply bolted on.
I found the desk locally. I got lucky and found an adjustable desk for only $50 locally.