Here's a fascinating looking into the seamier side of antitrust law (if antitrust could possibly have a seamier side). Basically, this CNET article alleges (or just states, one can't quite tell) that AMD has hired a consultant to show how much money Intel has essentially "stolen" from AMD through anti-competitive practices.
This is, of course, essentially the same as the Microsoft case, without the dubious economics. You have a competitor in AMD (among others) who simply haven't made the best product and marketing decisions, while Intel has done pretty well. In fact, there was a recent period of time when Intel was doing everything wrong, and AMD simply failed to capitalize on it.
Antitrust law is just a way for disgruntled competitors to stop successful companies. I refer you to this article at the Ayn Rand Institute for more.