Online Historical Newspapers is a free genealogy site that lists and links to Online Historical Newspapers. It’s set up by locale:

• Australia
• Canada
• Ireland
• Mexico
• United Kingdom
• United States

“Have you ever wished you could find links to all the online historical newspapers in one place?  A place where they were listed by county and city so you could find the newspapers your ancestors read?  This is the purpose of the Online Historical Newspapers Website. It is meant to be used as an aid to genealogists, historians, and other researchers.”