Google has begun testing adwords ads in the Google search suggestions i.e. suggestion you got after typing something in the search column at Google homepage.
Danny Sullivan notes at Search Engine Land that some users are spotting Google AdWords ads within Search Suggest. I also tried to check something like that, but not getting any ads in the search suggestions but one thing for sure, its probably going to be the most expensive place to get ads there.
Will it be effective to get ads there? I don't think if any advertiser would like to get ads there in the google suggestion; most of the clicks would be unnecessary / accidental clicks.