I have built sites and put lorem ipsum text in as place holder. Then when I put in the real text I find that google has indexed the lorem ipsum text. If the site has no inbound links, and the domain was not indexed before, and it has not been otherwise submitted through Google webmaster tools, analytics or that url submission form I used to use, how on earth does Google know it's there?
I've had similar issues with individual pages I thought were private on sites. There are no inbound links at all. Does Google keep track of where you navigate?