http://www.ikea.com/us/en/catalog/products/00115992/
http://www.ikea.com/us/en/catalog/products/60111123/
It's easy to build. It's sturdy, and it looks good.
What I dislike about the authors suggested setup is the fixed height. Often, the initial height that you set the desk to will become uncomfortable. As your body adjusts to using a standing desk, you will probably find that you would prefer something a few inches different from your initial setup. That would be a several hour project with something mount to the wall, but only takes about 15 minutes with these desks.
It's worth checking Craigslist in your area too, there's usually people selling these desks pretty cheap. At least that's been my experience; got mine used for $70.
EDIT: The Jerker (http://i.imgur.com/TyieC.jpg) is what I actually have (thanks chaostheory).
http://www.flickr.com/photos/symmetricalism/5488994391/
they really are great desks and are very configurable.
They consider it a bar table, but it works perfectly as a standing desk.
I keep a barstool by the desk for any periods when I am tired, although interestingly enough, I find that I sit when I'm learning, and stand when I'm producing (I'm a web dev). So exhaustion isn't the primary dictator of whether I'm standing or sitting.
http://www.ikea.com/us/en/catalog/products/40111124/
If not, I'm sure you can hack it to enable it to do so.
For myself I have a larger discontinued model called the Jerker. It supports large things just fine.
While the assembled height can be changed, do be aware that the increments are relatively large, like maybe 3 inches. It worked out fine for me, but might not be very comfortable for someone slightly taller / shorter.