1script - 6:53 pm on Aug 24, 2011 (gmt 0)
Well, one of those sites (just one out of the dozen) had a really bad break-in earlier this year. They've managed to redirect the homepage to a credit card scam page. That has been fixed relatively quickly (within a couple of hours) and the site did not suffer until three days ago.
Another affected site (on the same server) had a bogus subdomain added to it which was also redirecting to that credit card scam page during the same incident. Also got fixed and did not involve the actual site (don't want to divulge too much in the open).
Other than that incident in the past, I'm not aware of anything recent although I keep looking for any evidence of wrongdoing.