Business 2.0: Online radio’s other name might as well be “irrational exuberance.” Not a day passes when I don’t come across an announcement of yet another online radio service. And I see the excitement in the media. Despite the fact that only a couple of companies — Apple (AAPL) and Napster — have had success in the online music game, everyone thinks there’s money to be made selling online tunes. In the past decade, most online radio efforts have come to naught. Why? Go to read the rest on Business 2.0 website. Also my report on Real’s new Rhapsody service, here!