In a move that makes a lot of sense, Yahoo has integrated del.icio.us(a social bookmarking tool Yahoo bought out in 2005) into their search results.
While Google’s PageRank is becoming increasingly worthless, this is useful because it lets you see how many other times a particular link has been helpful to other people.

rails - Yahoo! Search Results
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del.icio.us
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But do a link’s delicious results improve its rankings in the yahoo search engine? In my opinion, they should. An algorithm based engine can only take you so far. The human aspect of delicious-based search results can give more meaningful results.

Google is playing with the idea of implementing digg-type voting into their results, and it will be interesting to see how these 2 ideas match up.