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We are looking for such kind of solution too. Except of mentioned above we are considering the start-up AdBooster which looks extremely fine.

Hey, I don't think there is any SEO benefits and the video your are referring to is somehow outdated and ironic as Matt Cutts doesn't display any file extension on his blog neither. On a usability stand point, it is better for users if the URL doesn't have any extension so they doesn't have to remember if the URL was ending with either .htm, .html, .php, .aspx, .asp, .jsp, etc. The shorter, the better. A shorter URL will be easier to share (ex: on twitter), tell on the phone, quicker to type, look better in SERPs, etc. Best regards, Guillaume Voyer.