There was a test of some sort a while back, and the result was that the BEST place for a menu (or sidebar) would be the right side, since most people (ok, forget China for a while...) start reading from the top left. Ofcourse if you're having banners and other info on the left side it's way better for those that own the banner(s)
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I like it the way it is, and now even more since that small banner on the right (proportable) is gone.