The SCO saga goes on: they're planning broader litigation, this time against Linux-heavy corporate users.
Despite the shock value of such blatant extortion tactics, ignore it - their incentive is to drag this on as long as possible, because they stand to lose nothing, and gain everything - and the courts will take a long, long time (at least in geek time) to figure out what all this is really about: the GPL.
Of course, they'll lose in the end, because from a legal point of view, the GPL is no less valid than any other license.
/. has a nice background post for context.