Google News Newspaper Archive. In the archive you will find hundreds of newspapers that have been digitized for reading online. You can search for a specific newspaper by title or browse for articles by date and title.
Applications for Education
The Google News Newspaper Archive could be a great resource for history students. One of the activities that I might have students do is select a significant event like a Presidential election and compare how it was reported by newspapers in different parts of the country.
H/T to Lifehacker.