“Kai von Fintel”:http://semantics-online.org/blog/2004/11/google_scholar links to one of the newest (and coolest) toys in the toolbox.

bq. “Google Scholar”:http://semantics-online.org/blog/2004/11/google_scholar

It returns academic papers matching a search phrase you look for, ranked by number of citations. Hours and hours of fun to be had!