Looks like DDG has led the way on some of this: Don't bubble: "We’re also introducing a prominent new toggle on the upper right of the results page where you can see what your search results look like without personal content. With a single click, you can see an unpersonalized view of search results." Default SSL: "That's part of why we were the first major search engine to turn on search via SSL by default for signe…
Contrary to DDG, it is really personal content (not ranking) here (i.e. content that might be accessible only to you). I think the ranking is still personalized when you disable Search+.
http://googlesystem.blogspot.com/2007/04/how-to-disable-goog...