It's a little disingenuous for the IE team to "discover" this just now. I'm pretty sure Google has been doing this for years, and it's well-known. (I certainly talked about it as part of a wider discussion about P3P policies with colleagues a year or so ago, and this isn't even my area of expertise.)
I also don't much mind what companies do with tracking cookies --- I recommend using the Vanilla Cookie extension to Chrome to create a whitelist of persistent cookies. It rather nicely avoids the problem.
I also don't much mind what companies do with tracking cookies --- I recommend using the Vanilla Cookie extension to Chrome to create a whitelist of persistent cookies. It rather nicely avoids the problem.