The folks at Yanko Designs seem to really like wheelchair designs, and have posted another one, this one by designer Tim Leeding. His concept is of a wheelchair that can be manually transitioned to a standing position to allow more normal social interactions and has a gear box for more efficient wheeling. Read more at the Yanko post, including a discussion by the designer about how his design distinguishes itself from similar stand-up wheelchairs.
Yanko: The Leeding E.D.G.E Wheelchair