Update: Aug/1/2010 - Due to excessive bandwidth usage issue this is no longer available for download.
The nixCraft FAQ collection is now available to anyone who wants to browse it off-line in a PDF format. This tar ball contains 1600+ Linux, *BSD, UNIX, Perl, Bash and scripting related faqs, mini-howtos, and tutorials compiled and written by Vivek Gite.
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With the growing ubiquity of, and user reliance on, mobile computing devices (laptops, PDAs, smart phones, etc.), loss or theft of a device is increasingly likely, disruptive, and costly.
Adeona is the first Open Source system for tracking the location of your lost or stolen laptop that does not rely on a proprietary, central service. This means that you can install Adeona on your laptop and go -- there's no need to rely on a single third party. What's more, Adeona addresses a critical privacy goal different from existing commercial offerings. It is privacy-preserving. This means that no one besides the owner (or an agent of the owner's choosing) can use Adeona to track a laptop. Unlike other systems, users of Adeona can rest assured that no one can abuse the system in order to track where they use their laptop.
This looks good solution but if thief wipe the hard drive at first boot then this software will not help you. If your laptop carries sensitive data encrypt it with software.
Click here to download open source Adeona software for Mac OS X, Linux and Windows operating systems (via Linux.com)