Crawls the web and finds papers. Therefore heavily biased towards recently published papers (i.e., 1997-present)
Has two search modes: a keyword-type search (not very good), and a citation search, which is amazingly useful
Citation search will weight search results by how heavily cited they are.
Good for finding pivot papers (heavily cited papers) about a particular topic, and for browsing the citation graph forward/backwards.
Often excruciatingly slow and/or too busy to answer queries.
Good for answering questions like, “What is so-and-so best known for?” and “Has so-and-so published anything with impact in the last ten years?” and “How cited is so-and-so?”
To search for a person "Paul W. McCartney? ," have to do something like "(Paul McCartney? ) or (P McCartney? ) or (Paul W McCartney? ) or (P W McCartney? )" to account for the ways people might cite papers.
Example: (Alan Turing) or (A Turing) or (A M Turing) or (Alan M Turing) Look at the bar graph at the bottom — note the war years spent at Bletchley. (Turing was convicted for homosexuality in 1952, and committed suicide in 1954.)
CiteSeer? ’s list of most cited papers are worth browsing. If you’re looking for worthwhile papers to read, this is a good start. I used to organize a reading group (“High-Impact Papers in Computer Science”) where each week we’d pick a paper from the CiteSeer? top cited papers list, read and discuss it.