Top 5 Anti-Spyware Products
To tell the truth, these are almost the only 5 products worth considering, not just the top. There are hundreds of anti-spyware products available, including many that claim to be anti-spyware but are malware products in and of themselves. Products like these 5 (Windows Defender, AdAware Personal SE, Spybot Search & Destroy, Webroot Spy Sweeper, and McAfee Anti-Spyware) represent commercial products from vendors you can trust.
Many users actually get their anti-spyware protection through a security suite such as Norton 360, or Trend Micro PC-Cillin Internet Security Suite. To find out how these 5 products rank, along with some insight into their strengths and weaknesses, check out this article from Paul Gil, About.com Guide of Internet for Beginners.