Stay tuned for the network's latest DVR strategy: acceptance. Armed with the latest Nielsen data, ABC, CBS, NBC and Fox are rushing to tell advertisers that even with a set-top box and its bevy of pauses, fast forwards and 30 second skips at the ready -- we're guessing this doesn't apply to Media Center users on automated setups -- most viewers simply settle in and watch the commercials anyway. The New York Times breaks down the commercial-plus-three ratings system the networks initially opposed that could end up saving shows like Heroes from