Google Scholar library

Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research. 

Google Scholar library is your personal collection of articles. You can save articles right off the search page, organize them by topic, and use the power of Scholar search to quickly find just the one you want - at any time and from anywhere. You decide what goes into your library, and we’ll keep the links up to date.

You get all the goodies that come with Scholar search results - citing articles, related articles, formatted citations, links to your university’s subscriptions, and more. Best of all, it’s easy to quickly fill up your library with the articles you want - with a single click, you can import all the articles in your public Scholar profile as well as all the articles they cite.

http://scholar.google.com/intl/en/scholar/about.html