In the past few years, we have covered a bunch of awesome standing desks. The Gaiam Evolve Balance Board can take your experience with them to the next level. It creates low-impact movement to engage stabilizing muscles in the back, core, legs, and ankles. The balance board makes it easier to get used to a new standing desk.
The board has a non-slip texture and an ergonomic design. It promotes a proper standing position. More info is available here.