Microsoft continue to carry the battle of search engine to the Google field, with the announcement of the launch of new malware filters that go beyond their "Drive-By-Detection" systems and adds additional detection. As security and safety are (and should be) huge concerns and as Google battled this very issue just a few month's back. You can read more that the newly launch Bing malware filter here: http://www.bing.com/community/blogs/webmaster/archive/2009/06/17/bing-keeps-the-web-safe-with-malware-filter.aspx
Bing absolutely believe that security is one of there top priorities in search engine.