In the 80s, as VCRs were becoming popular, I saw an interesting product that acted as a commercial eliminator for those who wanted to tape classic, black and white movies that were often on late at night.
The product simply detected when the signal went colour, and would trigger the pause button on your VCR. (In early VCRs this was not even infrared.) The commercials were colour, the movie was B&W and so you got a commercial free movie recorded.
In watching HDTV movies recently, I had the thought you could now reverse this process. The movies are in hi-def, widescreen, but most of the commercials are in regular def, 4:3 ratio. So a commercial eliminator could pull the trick of deleting the old (rather than the new) on these shows. Of course this trick won't last forever. As HDTV grows more of the commercials will move that way. It's even easier to justify if it sells product.
Low blogging the last while, been on the road. In Toronto now for Jerry's Retreat.