Zone-h.org

Do you know about Zone-h.org? It is best website to know about any hacking happen/.

Zone-H.org is a website archive of versions of defaced websites. The sources of the hacked website URLs submit their information anonymously, and often include an image of the hacked site. Sometimes the hackers themselves admittedly submit their hacked pages. Many feel this glorifies hacking. Some hackers who post phishing sites (illegally gathering credit card, bank account or other personal information and/or passwords by posing as a legitimate site) use Zone-H's list of hacked sites to find websites whose security status makes them vulnerab

Wikipedia

They also have twitter page for update :-
http://twitter.com/#!/zone_h