Just wanted to send you the replay of the webinar we did with Rob Avis and Curtis Stone on Passive Solar Greenhouses.  Personally, I come from a natural building background and work in an extreme climate, so these systems made obvious sense for year round, stable food growing.  In Curtis and Rob's case, these greenhouses helped them grow food and gross at least 1k a week even in the dead of winter, along with giving them a low cost cooling system in the hottest months of summer.  These systems are fascinating and are applicable in every climate, so if you're interested in year-round growing with greenhouses, then definitely give the replay a watch.