seansquared - 6:45 pm on Aug 22, 2010 (gmt 0)

If your merchant provider doesn't include scanning as rocknbil noted, check out Trustkeeper. We use multiple external and internal scanners, and with regards to the external ones, Trustkeeper has so far provided the cleanest results with the lowewst number of false positives, meaning wwe aren't chasing shadows but fixing real issues as they crop up. It also has some great reporting features.