The Canadian Content of the Late Show with David Letterman will increase by several hundred percent as our own uber-group Broken Social Scene hits CBS tonight. We wonder whether Paul Shaffer will join Kevin Drew, Brendan Canning, et al. BSS will be joined by new Lois Lane Kate Bosworth and hopefully be upstaged by a bunch of middle-aged New Englanders who do crazy things with Mentos and Diet Coke. Letterman airs at 11:30 ET.......