I'm curious if this is simply some silly patent issue where people would make it but MS or Logitech owns a patent that is preventing it without significant modification...
Lots of swaying and occasionally stepping back and fourth a few times is important and will keep the blood moving which combats things like varicose veins. There is no substitute for taking breaks and getting a good walk in...
Lots of swaying helps keep everything loose as well as keeping focused on using the leg muscles to support yourself instead of relaxing and letting the cartilage do all the work which is the only real concern I've come across for a standing desk.
Great comment, personally I do rock climbing and Ashtanga yoga for my core strengthening and I agree that you should work on improved overall strength. A big win on the standing desk is the allowance of high amounts of movement (especially when very focused on the screen). Things like the SI joints and the sacrum which get zero movement from sitting. Lots of swaying helps keep everything loose as well as keeping focused on using the leg muscles to support yourself instead of relaxing and letting the cartilage do all the work.
I need to update the pictures of the IKEA desk and cart as they don't look too bad. The mobile desk on the other hand is not all that pretty but it's a work in progress and should get better over time... "Functional first, sexy second!" I'll suffer an ugly desk that allows me to fly anywhere on the planet and work comfortably enough.
Thanks for comment, I didn't know about the Kickstarter Keyboard (I just backed it). I have to use a split keyboard to avoid wrist pain so my options are very limited. If this isn't an issue for you then the Das Keyboard is very nice in my opinion.