In Pictures: Google's most innovative projects

Google unveiled two new products at its I/O developer conference: the Nexus 7 tablet and Project Glass. Here's a look at how some of Google's other famous projects got their start.

1. Google Books Library Project, 2004

The Google Books Library Project, also known as Google Book Search, lets you preview excerpts from books and bibliographic information. Or, if the book is out of copyright, it lets you view and download the entire book. Google is currently working with several major libraries to include their collection of books in search.

Google's Library Project has had its fair share of controversy since it launched in 2004: Some publishers have filed suit to stop it because they don't believe that a third-party should be able to copy and index copyrighted work.

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