Microsoft's DNT

After Microsoft announced Do Not Track would be turned on by default in Internet Explorer 10, the latest W3C DNT draft proposal suggests Do Not Track should not be on by default

This would probably be the first time ever Microsoft's security control has been deemed as "too secure".

A little more info around how online tracking works.

Update 09-Aug-2012:
MS goes ahead and enables the setting as default.

Update: 27-Sep-2012:
A good write-up on why this would adversely impact the internet.