As far as I understand, one of the goals of StackOverflow is to be found through search engines. Recently I stumbled upon Subscribed Links for Google. If I understand it correctly it is possible for third parties to integrate in Google. They can do this by creating a subscribed link. If a Google user subscribes on this service and searches for a certain keyword he gets special search results added from this third party.
Would it be a good idea to create a subscribed link for the tags your users favorited? Is this even possible? In that case he gets specialized results from StackOverflow whenever his query contains one of his tags.