> EDIT: It looks like they've explicitly said the toolbar does not cause things to appear in search results

I read this too after posting, but I'm skeptical. It wouldn't be the first time they claimed to not do things they later admitted doing ... The rationale being that search engines need a way to discover new URLs quickly and keep ahead of the competition (indexing speed and breadth).

I'd also like to know what exactly Google Desktop Search does with URLs it finds.