Google launched a search service aimed at academic literature. The services allows "you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research. Use Google Scholar to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web." The ranking is apparently by citation with is pretty cool since that's how most people would measure a paper's influence. Clicking on the "cited by" link gives you back the citing papers. Now, it they just had a link to the bibtex for the reference...