You know it's coming: the inevitable slew of boutique 3D television channels that will serve nothing but gratuitous content the same way all those HD-specific stations and their nature programs did a few years ago. Comcast wants to be at the forefront of the 3D exploitation capitalization to come, and while its current offerings are modest (a 3D version of The Final Destination, a Jonas Brothers concert, and other stuff your step-brother Billy might like) and only offered in anaglyph format (red/blue glasses), the good news is it isn't charging any extra for the content -- yet. Comcast isn't saying exactly what's coming next, but specialized channels sh
