BBC News : Two million US PCs recruited to botnets

"The US leads the world in numbers of Windows PCs that are part of botnets, reveals a report.
More than 2.2 million US PCs were found to be part of botnets, networks of hijacked home computers, in the first six months of 2010, it said.
Compiled by Microsoft, the research revealed that Brazil had the second highest level of infections at 550,000." ~ unknown

http://www.bbc.co.uk/news/technology-11531657

This number is not really surprising to me, maybe a bit bigger than I expected, but not a surprise. I have worked on so many PCs and MACs that were used by people who don't believe in cyber security (ie anti-virus, anti-spyware, firewalls). Windows is not secure and OS X is not perfect, you need to set both up properly in order to be secure.