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 signed-in users last year."
They already have search categories in the top-left. In their screenshots, they're on the "Web" tab. Why not just add a new tab representing generic search, make that the default, and leave the web search as it is today?
Making the "Web search" also search your personal data, then giving you an option to make the "Web search" do a non-personalized search just seems backwards to me.
"If you turn off personal results and stay signed in to your Google Account, you won't see results personalized based on your Google+ circles (or suggested connections), Google products, or your search history.
If you turn off personal results and sign out of your Google Account, you may still see personalized results and results based on the context of your search."
http://googlesystem.blogspot.com/2007/04/how-to-disable-goog...