After my win rate with Zoo dropped below 50%, and then well below 50%, I switched to Midrange Druid, and when I couldn't even get my win rate with Midrange Druid UP to 50%, I tried Brian Kibler's Midrange Hunter. At this point I haven't lost a match with it, so that's good. The list I played can be found here.
You can contact or follow me on twitter @blisterguy or add me in game blisterguy#1761