Sony's Rootkit. Sony has finally crossed the line with their Digital Rights Management.
Some more info here.
This should be enough to start a class-action lawsuit against Sony - any takers?
And here's one of their idiot developers asking for help on writing a cd driver filter.
For those who don't know - a rootkit is commonly used by hackers to hide files on your computer so they can later exploit it for their use. They'll often hide files to crack your password hive, or for remote access. All in all - evil stuff.
Edit: Turns out people are already using this malware to exploit Worlds Of Warcraft's cheater software detection software. How long before this is used for something more nefarious?
More info also here.