Grande-
Has there been any luck (by you or another sportsbook) in tracing back any of the infected computers to its owner? By this I mean, actually contacting the owner of an infected computer to help them clean it up and identify the infection. Theoretically, if you could find enough of the infected computers, you might be able to learn how/where/when they got infected. This information may be useful in tracking down the bastards that started this, or in distributing an anti-virus.