Google's version of an academic database, Google Scholar searches many publisher's journals, academic websites, institutional repositories, and other similar sources, including the ScienceDirect and JSTOR databases. You can even link the library's database and journal subscriptions to Google Scholar results!
Google has scanned millions of books, and added book information from publishers, to create a huge searchable library. Not all the books are fully viewable, but you can limit to full view, or find links to libraries and bookstores to get a physical copy.
Open Access (free web-based) scholarly journals from around the world. About half the journals can be searched on the level of the individual articles. All DOAJ journals are listed in our journal finder/Find Article @ SCSU service.
ArticlesMore than one word in a field will be treated as phrase.
|and or not|
Digg collects, ranks, and categorizes websites and stories, all based on user input.
There are even search engines and guides for search engines...
Yippy, formerly Clusty, searches several top search engines and organizes results into clusters based on similarity.