Periodicals
Life magazine 1936-1972
Popular Science magazine 1872-present
Popular Mechanics 1905-2005
New York Times 1851-1922
Notes and Queries 1850-1853
Punch 1841-1921
Scientific American 1861-1896
Scientific American 1846-1869
Allo Police
Archives
Chronicling America 1880-1922
Project Gutenberg periodicals
Washington State historical Newspapers
U Mich’s Making of America Periodicals
Cornell’s Making of America Periodicals
Northern New York Historical Newspapers
Digital Comics Museum
List of Digitized Newspapers at Google
List of English Language Digitized Magazines at Google, French Language, is there no global list?
Lists of Archives
ICON Newspaper Digitization
British Columbia Digital Library’s Index of Online Newspapers
Historical Highlights
Modern Mechanix blog
The Daily Mirror
Lileks
Times Archive Blog
The Hope Chest
Advertising for Love