I use the one described here ( http://iamnotaprogrammer.com/Ikea-Standing-desk-for-22-dollars.html http://iamnotaprogrammer.com/Ikea-Standing-desk-for-22-dolla.

I use the one described here ( http://iamnotaprogrammer.com/Ikea-Standing-desk-for-22-dollars.html http://iamnotaprogrammer.com/Ikea-Standing-desk-for-22-dolla... ): an Ikea "Lack" table with a shelf attached to it for the keyboard. I have a normal laptop stand on the left side of my desk where I set, and one those Lack tables on the right side with a monitor on it. When I want to stand, I just move my keyboard and mouse to the shelf and setup my laptop to use the monitor instead of its own screen. I think the Lack table also exists in a version that is twice as wide, but I'm not sure.