The same as westin,

Also:

AVG Anti-rootkit
AVG Anti-spyware
AdAware SE personal (LAVASOFT)
A-Squared (EMSI Software)
SpywareBlaster ( Javacoolsoftware: Complements Spybot S&D)
Avast! (ALWIL Software)

CCleaner (Piriform) yes, it is not strictly a security product but:

1. It cleans out cache and temporary files where malware likes to hide.
2. If you are trying to clean a system then there is that much less to scan

WinPatrol (Bill P Studios)
RegistryProt (DiamondCS)

I am starting to evaluate Mamutu (EMSI Software) It is another behaviour based malware blocker.