The LaptopLock

If a computer is lost the hardware can be replaced, but the data is priceless. The LaptopLock allows you to protect your data. Encrypt or delete files if the computer is stolen, display a message or execute custom instructions. When the computer connects to the internet, the connection information is traced and used to help recover the laptop. The software is free, but an account on the developer's Web site is needed.

Version 0.9.4 adds secure data wiping and Windows Vista compatibility.