Ask Jeeves does it well, so now who is playing follow the leader? There is a thread at SEO Chat named Google Image Suggestion which describes a member (who has been at SEO Chat for as long as I can remember) who sees Google Image results at the top of the normal search results. He conducted a search on charles manson and saw the following screen.
I personally do not see it, but the screen capture is proof. Of course, Ask Jeeves has been doing this for a while now. Go ahead, and do a web search at Ask Jeeves on charles manson.