Tired of those ridiculously clever Mac vs. PC commercials painting them as out-of-date and incompetent, Microsoft is trying a new ad campaign of their own. A $300 million dollar ad campaign to be exact, with Jerry Seinfeld as the star-power at the helm. We're a PC-owner and we find ourselves nodding knowingly at the Apple ads all the time. So Microsoft and Seinfeld are going to have to come up with something mighty clever......