There was a time when open-source software was the domain of computer geeks and do-it-yourselfers with more time than money. But, as Oracle's legal salvo against Google highlighted last week, those days are long gone. Oracle (ORCL), through its purchase of Sun Microsystems, has become one of the largest purveyors of open-source software in the world. Google (GOOG) makes the open-source and increasingly ubiquitous Android smartphone operating system. Their fight revolves around Java, a programming language Sun made predominantly open-source several years ago, but which Oracle's founder and CEO Larry Ellison now calls "the single most important software we've ever acquired."