Just thought you might like to know this website. It is a free online scanner, although it only scans a single file at a time but you can upload a zip so long as it is within the size limit allowed and it will scan it. It uses multiple virus scanners. Right now it's using AntiVir, Arcabit, Avast, AVG, Bit Defender, Clam AV, Dr. Web, F-Prot, Fortinet, Kaspersky, Nod32, Norman, UNA, VBA32
Link to site
http://virusscan.jotti.org/