Psystar has laid out its defence plans against Apple. They will be suing them under the Sherman Antitrust Act and the Clayton Antitrust Act arguing that tying OS X to Apple hardware is monopolistic.
Psystar, the plucky little Mac clone company, is still selling its wares despite the Apple lawsuit. They've hired some pretty heavy hitters themselves, so I'm not quite convinced they're really doing this on their own.
Regardless, I wish them luck. If they can force Apple to accept commoditized hardware it will be a big win for the whole industry, Apple included.
Well, except for Microsoft.