Identity theft used to involve someone rifling through your garbage. But now more than half a million laptops—full of tax returns and love letters—are stolen every year, estimates computer insurer Safeware. And even if your computer never leaves your sight, hackers can weasel into it over the Internet. Here are three technologies that will safeguard your digital data, whether it's on an office desktop or a stolen laptop.

Each issue, PopSci rounds up the must-have products for the month. This March, check out a media streamer that lets you buy movies with just your remote, a Bluetooth speakerphone that charges in the sun, a super-strong vacuum and more.