http://www.malware-test.com/
A test of some anti-spywares.

Fourth Round (April 3, 2006):

Cleanup Success Rate for Entry-based Viewpoint:
‧Aluria Anti-Spyware: 3.41%
‧Lavasoft Ad-Aware: 10.23%
‧McAfee antispyware: 3.98%
‧Microsoft AntiSpyware: 0.00%
‧PC Tools Spyware Doctor: 10.23%
‧Trend Micro Anti-Spyware: 2.84%
‧Computer Associate Anti-Spyware: 7.95%
‧Sunbelt CounterSpy: 9.09%
‧Spybot S&D: 0.00% <===
‧Webroot Spy Sweeper: 0.00%
‧Microsoft Windows Defender: 0.00%
Cleanup Success Rate for Process-based Viewpoint:
‧Aluria Anti-Spyware: 3.45%
‧Lavasoft Ad-Aware: 13.79%
‧McAfee antispyware: 6.90%
‧Microsoft AntiSpyware: 0.00%
‧PC Tools Spyware Doctor: 10.34%
‧Trend Micro Anti-Spyware: 3.45%
‧Computer Associate Anti-Spyware: 10.34%
‧Sunbelt CounterSpy: 10.34%
‧Spybot S&D: 0.00% <===
‧Webroot Spy Sweeper: 0.00%
‧Microsoft Windows Defender: 0.00%
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I use this program for one year. The program is very good.