I noticed last week my google traffic to my Anaheim Ducks blog was off, but figured was due to the offseason, but it turns out this exploit was probably the case. I found a bunch of invisible gambling links in my index page. Now I've patched and cleaned the site back up but have to 'request review' with Google to get back to clean status hopefully. Which sucks, since for many terms I'm #1-3 on Google above sites like NHL and TSN and AnaheimDucks.com
BTW this site may be helpful for those wishing to check links to any badware, since Google/Stopbadware.org aren't very helpful when they block you.
http://www.bad-neighborhood.com/text-link-tool.htm