So, a new Microsoft security hole has been discovered. Basically, your computer could begin downloading child pornography, emailing the FBI, and/or exploding at any moment.

Okay, maybe not that. But it can be made to run unsigned (aka arbitrary) code simply by someone making it display a properly manufactured JPEG. All it would take is someone slipping one of these things into an ad banner to zombify any number of Windows machines. That's no good. You might want to give Windows Update a ring.

On the other hand, there are more pressing technological threats.