Cookies
So I now get the opportunity to consolidate the adverts I post (and the website(s) I run), with the adverts I buy, with the searches I do, with where I live, with my bank account details, and now, my views on current affairs.
Wow - thank you, Google..
I never used to delete my Google cookie; with the new search-history thing, I will definitely be setting up a script to get me a new cookie daily.