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Glary Utilities
This is a free security and system optimization utility suite that I hadn’t previously heard of, but it comes well-recommended. Designed for private (single PC) use, Glary Utilities features anti spyware, trojan, and adware functionality, and is intended to protect your privacy. Visit www.glaryutilities.com to download
Malwarebytes Anti-Malware
With fast scanning and a daily definition update, this tool is described as “the next step in the detection and removal of malware” and it is certainly being used more and more, offering a no-nonsense approach to freeing your system of adware. Malwarebytes have a free and premium version of this tool available, depending on your requirements.
MacScan

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Specifically for Apple Mac OSX, this application scans blacklisted tracking cookies and removes them, as well as receiving regular definition updates. It pretty much replicates the task of deleting temporary internet items and cookies (or resetting your browser), and is available for $29.95.
Despite what you might have been told, Mac OSX is susceptible to malicious software, particularly adware and spyware.
Download from securemac.com.
Internet Cleanup
Strangely not compatible with the latest release of OSX (10.6 Snow Leopard), Internet Cleanup is designed to stop spammers, malware and prevent data theft. It’s a useful catch-all internet security application for Apple Macs, and you can download from www.smithmicro.com.
NoScript Firefox Extension for Linux
Linux users unfortunately are not protected from spyware tracking cookies – however their ability to do any damage to your system can be completely negated by installing this free Firefox extension. Basically, the extension prevents plugin scripts being run on any website that you have not decreed as “safe”, which is quite a total solution! Download this extension from noscript.net.