I’m a big fan of stand-up desks, and this is a really good article on them.
Sitting for long stretches of time (work, anyone?) is one of the worst things you can do to your body. And buying or building a stand-up desk is one of the best ways around that.
The article is called The Complete Guide to Choosing (or Building) the Perfect Standing Desk. Depending on which route you want to take, and also how much you want to spend, it has links that will take you there.
Also, here’s a great article about how to build a Stand-up desk for around $30 using items you can buy at Ikea’s. That what I did, and it works great.