16th & 17th c. titles online through Google Books

Google has formed partnerships with many of the great libraries of Europe, including the Czech National Library, the National Library of the Netherlands, the Austrian National Library, the National Libraries of Florence and Rome, the Municipal Library of Lyon, Ghent University, the Bavarian State Library, the National Library of Catalonia, the University Complutense of Madrid, the University Library of Lausanne and the Oxford University Library.
 
To date, Google has scanned about 150,000 books worldwide from the 16th and 17th centuries, and another 450,000 from the 18th century.

...read more on the Google Books blog.