What do you do with an old PC? Most of us just give it away; if you’re mindful of privacy issues, you might format the disk first. There have been lots of recent cases where organizations have failed to properly clean disks of confidential information before decommissioning the disks and selling or giving them away. The BitLocker Drive Encryption feature of Windows Vista can help solve this, though– when you decommission an encrypted volume, you can remove the keys (as detailed in this column) and render the volume permanently unreadable. Sweet!