Moving to a responsive design is a good idea, but you want to be sure it's working all the way down to small (320x480|480x320) mobile screen sizes. It seems the right sidebar doesn't either go away or move below the main content on the small screens like it should do. The new design is okay down to small tablet sizes, but some smartphone users won't be able to use the site very well until that sidebar issue is resolved. Should be pretty easy to fix that.
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