I'm interested in a different type of site isolation, which would stop advertisers etc. tracking you, without having to rely on a maintained list of tracking companies.
The idea is, that when browsing a particular site, all cookies set (including third party cookies) are kept in storage specific to the site being browsed (i.e. the site matching the domain in the address bar). E.g. if I'm browsing ZDNet.com, and a Facebook cookie is set, it is still stored somewhere under ZDNet.com cookie storage. If I then browsed Facebook.com, it would not be able to see that cookie, as it would have its own separate cookie storage.
Obviously it would need to be possible to add some exceptions on a per-site basis.
Ever hear of a feature like this?