Google has developed a Safe Browsing diagnostic page that will provide information if a particular web page poses a risk to users.

http://www.google.com/safebrowsing/diagnostic?site=http://www.halfzerocan.com

Just replace www.halfzerocan.com with the URL of the site that you want to test.

All information it shows is historical over the last ninety days but does not go further into the past.