Subaru has built the world's first flat four-cylinder diesel for production cars. Europeans have been driving it in the Legacy and Outback since January, and in about a month, after the Paris Auto Show, they'll have it in the new third-gen Forester, too. Americans...well, we'll have to wait, but we could get the boxer-diesel Forester sometime in 2010. If, that is, Subaru gets the message (wink wink) that American buyers are seriously interested.