FYI...
Recent badware stats-
http://blog.stopbadware.org/2012/04/27/recent-badware-stats/April 27, 2012 - "... Enterprise users experienced an average of 339 Web malware encounters per month in 4Q11 (
205% year over year).
• Avg. 20,141 unique Web malware hosts per month in 2011 (vs. 14,217 in 2010)...
• Approx. 30,000 new malicious URLs each day in 2H11; 80% of those are legitimate. 85% of malware comes from the web.
• Malicious sites
up 240 percent in 2011...
• 40% of malnet entry points are via search engines/portals...
• 23% of malicious domain registrations could be blocked with basic validation of contact info
• Rogue AV campaign infected 200,000 Web pages, 30,000 unique hosts... geographically dispersed visitors.
• On average,
-two- popular websites (among the Alexa top 25,000) serve
drive-by downloads each -day-. An estimated 1.6 million vulnerable users were exposed to drive-by downloads in one month across 58 popular (Alexa top 25,000) sites."
(Links to sources available at the stopbadware URL above.) 
Topic: Badware stats...