This morning, I spent nearly an hour and a half removing 'XP Anti Spyware 2009' as well as a trojan loader called brastk.exe from my system after I checked a website for lyrics, and the site in question performed a stealth/driveby install on my system. Sad to say, this was not through any security issues with IE, as I have purposely avoided using IE for this reason, I was using Opera instead. --Sadly, the days of malware affecting just the IE browser are now over.
If you utilise programs such as Spybot S&D, Ad Aware, etc,etc, I strongly encourage you to get the latest version of your malware removal programs, or at least perform an update on it's malware definitions.
Luckily I knew what was happening as soon as my computer shut down all apps and started to reboot, and I took precautions.