Google search is the biggest server-side mashup

Each search result page is a mashup of multiple pages, their snapshots, and possibly different representations. Of course, some contents are old, but some "important" pages are refreshed constantly in Google's index. Now they even add features like SearchWiki to personalize it. Maybe people will like the idea of SearchWiki more and more. In fact, we have used a personal mashup for a long time --- the Google Reader.