Old newspapers online

Here's a site that provides access to more than 4.1 million searchable newspaper pages from 581 newspaper titles, published in 25 states and the District of Columbia between 1836 and 1922. The site is the National Digital Newspaper Program and it's a part of the American Memory site at the Library of Congress. Of course, the library has access to the NY Times Historical Database, which is the full text of the NY Times 1851-2007.