This morning I noticed in Google.no and google.co.uk that Google was inserting a hashtag (#) immediately after its TLD in the search results URLS.
This means no URL string will be passed in a referral string.
So no keyword data
No data about whether it was personalized
No data about which page number the user clicked on in the serps.
No language or country data.
I see the new syntax on some searches but not others. Omniture and SEOs won't like that!