Google has launched a personalized Web search service
that stores users' search histories, builds individualized search data into Web results and suggests related searches. Currently in beta, the aim of the service is to provide users with a Google service that is an extension of a user's online memory.
I guess one day we will probably all have personal profiles (a bit like Windows profiles, with bookmarks, personalised settings, etc) stored on the internet somewhere, so that all you have to do is log into anyone's machine that you are authorised to use, and your own desktop will follow you around, reconfiguring itself. Although this is not quite what Google are currently offering, it does seem that things might go that way one day.