One of the pioneering online media companies, CNET, is being bought by CBS. While the various CNET properties have a large audience, investors have become increasingly frustrated with the stock, which for the past few years has traded well below its once lofty heights. Those investors should be happy with CBS's offer, which represents a 45% per share premium over the previous day's close. CBS, for its part, sees CNET as providing more online outlets and marketing opportunities for its content. So can these two find bliss? Who knows. The last celebrity marriage between old and new media companies - between AOL and Time Warner - hasn't worked out so well.