I don't have one yet, but am looking to buy one. I think it's important for the desk to be adjusted easily. There will likely be times when you want to sit.

So far, I've found the following adjustable desks:

• http://store.steelcase.com/go/products/detail/ATP2454/
• http://www.beyondtheofficedoor.com/RA-CUSTOMNHWTF.php
• http://www.beyondtheofficedoor.com/RA-24XXNHWTF.php
• http://www.beyondtheofficedoor.com/MAY-5XXXL.php
• http://www.geekdesk.com/

Does anyone have any first-hand experience with any of these?