Rise of the Small Botnet
wiredmikey writes "Botnets controlled by criminal enterprises all over the world continue to multiply at a steep rate, and it is now arguably the smaller, harder-to-trace operations that organizations should be the most worried about. Not only are smaller botnets cheaper and easier to build out and operate, but criminals have already realized that large-scale botnet activity attracts unwanted attention, and not just of law enforcement."
The vast majority of current exploits are targeted at applications, rather than OSs; primarily Acrobat Reader and Java at the moment.
Regardless, no OS can overcome the problem of permitting users to carry out administrative tasks without allowing them to execute malicious code when they really, really want to see the dancing bunnies.