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I'm sure some would say that about a couple of my sites but they surely don't suck as hard as the flotsam and jetsam i see in the serps every day above me for many phrases.
Changing to text-based advertisements and respected providers may be one way to prevent this possibility.
If you are running common scripts, ensure they are the most up-to-date ones. Remove any scripts you aren't using.
Discover whether or not other websites on your server have been compromised, if you are on shared hosting.
The site was on a shared server which was hacked, all my index pages had been changed with malicious iframes.
As far as I remember Google did contact me by sending emails to various 'standard' email address's such as firstname.lastname@example.org etc.
I had to work with stopbadware.org to have the warning cleared.
I think Matt Cutts has blogged about this feature.
PS Have you seen Matts video webmaster tools yet? Not to be missed, him and his cat....its great!
It wasnt about my site, i over reacted , misread the warning. If not for a flood of other aggravations and difficulties i may not have reacted in such a knee-jerk fashion, but i am on the edge of losing it as my demo CD title suggests.
Banging head against wall. I am a bonehead. BONEHEAD. Sorry about that Google, won't happen again. If it does at least it will be some new boneheaded complaint.
In fact, there are so many bad guys on Google I hate to have to do any research anymore, just stick with the sites I know are safe.