Interesting site:
http://winnow.oitc.com/malewarestats.php
Quote

When a piece of Malware is detected by the Malware Incident Reporting & Termination (MIRT) team, it is uploaded to VirusTotal for analysis. The performance of each antivirus engine is monitored by CastleCops. Once an hour, the system checks for updates. If there are some, the information on the performance of the 36 antivirus engines on all the detected malware is accumulated and statistics are updated for display by OITC.

The statistics provided here are an indication of the ability of the AntiVirus system's ability to deal with NEAR 0-day infections. The performance by each antivirus system on early detections do not reflect the overall performance of an antivirus system. Consult with your IT department or computer SECURITY specialist for a more detailed analysis.

These performance statistics have been accumulated SINCE Saturday, 2 December 2006, e.g. for the last 389 days. The most recent malware was detected and processed as of Tue Dec 25 13:57:08 2007 EST.