Well, slightly different placement. If you use Google and do a search on a keyword phrase with the default settings of ten per page, you will see some indented results. If you change your Google search preferences to a higher number displayed on one page, i.e. 100 results per page, you will notice a slight difference. Basically, Google likes to group the results from one site together, with only 10 results on a page, it would be redundant to show five or so results from the same site of the 10 results displayed. But with a 100 results per page, it does not cause the same issue as wit 10 results per page.
There is a thread on this topic at WebmasterWorld.