A relentless neophilia is Silicon Valley's signature characteristic. One must have a new iPhone, a new Twitter, a new electric car. You're either in beta or in the grave. That's why I'm intrigued by two decisions by Dell and Sony. Dell has figured out a way to wriggle around Microsoft's licensing rules and still sell its discontinued Windows XP operating system. Sony, meanwhile, is profitably selling its nine-year-old PlayStation 2 videogame console in markets like India. This just isn't done.