The results? None of the AV/AM products received a rating of “very good” (the highest rating), but several performed well. These received their Advanced+ rating (the highest rating) (listed in no particular order): eScan, Symantec, Microsoft, F-Secure, Kaspersky, and Bitdefender.
My favorite? Microsoft Security Essentials, which is free for non-commercial use.
Summary of report: Battle of the anti-virus: What is the best software?.
Report: (PDF WARNING) Antivirus Comparitive: Malware Removal Test (September/October 2009)