Here are some of the web site services that check whether a particular site we want to access is safe or not. This information is available in cnet.com
Unmask Parasites. Do you know the dark side of your site? LINK
Norton Safe Web
Hosts for your protection
Google safe browsing
http://google.com/safebrowsing/diagnostic?site= followed by the site you want to check, such as google.com or an IP address