I have a client which is a car dealership. In Google Analytics, I see that the unpaid keyword "used cars" brought in 11 visits last month. This doesn't make sense to me, because this is a highly competitive keyword, and this is just one little car dealership website. So I used a tool (ibp) to check the first 10 pages of 7 search engines, and my site doesn't rank for this keyword on any of them. So how are visitors finding my site with this keyword??? I've seen a few other instances like this. I have another client that is getting organic traffic from the keyword "specials", but they don't rank for it.