In case you still buy CDs, EFF has a handy list of all Sony-BMG CDs with the nasty copy protection.

As we've mentioned before, Sony-BMG has been using copy-protection technology called XCP in its recent CDs. You insert your CD into your Windows PC, click "agree" in the pop up window, and the CD automatically installs software that uses rootkit techniques to cloak itself from you. Sony-BMG has released a "patch" that supposedly "uncloaks" the XCP software, but it creates new problems.