tedster - 5:53 pm on Nov 24, 2010 (gmt 0)
This is google stuff. Google Toolbar feature. Called either Quick Scroll or Best Match.
Well I'll be - I mistook a real Google feature for malware ;) Now I even remember a patent they have in this area. And, by the way, I just installed the new Google Toolbar to test this, and I still can't get it to work on this Intelliscan search. Now I don't think it has anything to do with your website.
So it is not related to the new Instant Preview feature at all - sorry for dragging this discussion off topic.