Matt Cutts of Google announced on the Google Webmaster Blog that they have added a new notification for hacked sites to the search results.
Google had malware notifications in the search results since 2007, but now Google is adding a notification for searchers to be aware that the site they may click on is hacked. It is important to note that a hacked site might not have malware on it.
Here is a picture of a hacked notification, which is a hyperlink that reads “This site may be compromised.”
The link will take you to this Google document explaining why the label is on that result and how the webmaster can remove the label.