For a long time, when you would be logged in via something like Gmail or even a straight "Google Account", you could go into the privacy/advanced settings and turn on something to save your search history if you were so inclined. I never wanted it turned on, so I left it off.
I just now searched for something at work and I saw in the autocomplete dropdown list, in purple, a term I searched for at home last night. Since I'm logged into the same Gmail account at home and at work, my guess would be that this means Google is saving my search results now.
Thing is, I can't figure out how to turn it off now. I can't find the page where this was enabled/disabled before and I'm thinking this may be tied to the recent Google+ thing and account migration.
Does anyone know if there's a way to turn off Google saving your search results anymore?