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Google now allows you to add tags to sites in your search history.
Hopefully they will:
I would love to do one click on a search result to say "i dig it", and have it popup a line where I can put tag names and a short desc.
Then they have access to rating such as: "the user clicked on this after the search of Foo", "The user activelly said he dug it and tagged it".
This should all happen inline via Ajax of cos ;)
Read: Google Delicious?