Although I'm probably jinxing it just by mentioning it, winter in the Midwestern U.S. should be ending in April, and few green shoots and buds should be just about to emerge. For the past couple of years, one of these has been our "green/sustainable machine" cover article, which is set to appear in the April 2012 issue of Control Design. So, if you or anyone you know might have some expert commentary or end user examples, I would love to hear about them. The main questions I'm trying to cover are below.