With the recent amendment (http://www.wired.com/threatlevel/2012/06/default-do-not-trac...) to the spec of DNT that the header should only be honored if the user has actively chosen not to be tracked, I guess we've just created more data that is transmitted with every HTTP request and subsequently ignored on the server.
As IE10 sending DNT isn't a response to a conscious user decision ("I accept the defaults" is not consciously deciding "I don't want to be tracked"), servers are basically free to ignore the header if the browser is IE10.
This also means that IE10 will for all intents and purposes always be tracked regardless of what the setting is set to and whether the server in general honors DNT or not (currently I know of only twitter to do so).
As IE10 sending DNT isn't a response to a conscious user decision ("I accept the defaults" is not consciously deciding "I don't want to be tracked"), servers are basically free to ignore the header if the browser is IE10.
This also means that IE10 will for all intents and purposes always be tracked regardless of what the setting is set to and whether the server in general honors DNT or not (currently I know of only twitter to do so).
Way to go!