If you travel across national borders, it's time to customs-proof your laptop.
Customs officials have been stepping up electronic searches of laptops at the border, where travelers enjoy little privacy and have no legal grounds to object. Laptops and other electronic devices can be seized without reason, their contents copied, and the hardware returned hours or even weeks later.
The information security implications are worrisome, to say the least. Fortunately, you have some technological defenses against overly snoopy border agents.