I just came across this article about Internet Explorer and it's continuing track record with security holes:
Time to Dump Internet Explorer
Good line:
You know, fool me once, shame on you; fool me twice, shame on me. Who's shamed when it's "fool me the 432nd time"? Who's the fool?
It contains good points - almost every spyware problem, with the exception of people installing P2P software, can be solved by getting rid of Internet Explorer. Scary thought, considering how integrated IE is with Windows.