Dick Eastman recently published two articles about historical newspapers being published online. Newspapers, of course, can be a major source of genealogical and historical information.
First, ProQuest announced the launch of ProQuest Obituaries. This collection offers access to obituaries and death notices from the full runs of major national newspapers dating back to 1849. Many public libraries have access to ProQuest's collections. Many of these libraries offer remote access to their patrons, meaning, you may be able to access the new obituary collection from home using your library card. See the press release here.
Also announced at the FGS Conference in Boston - the American Antiquarian Society's newspaper collection will be publishing their historical newspapers to the Internet. This society, headquartered in Worcester, Massachusetts, has one of the finest collections of historical newspapers in North America. They are offering a preview of the new service at the conference, but have not yet announced when it will be available to the public.
In the mean time, over 670 links to newspaper resources are available here. Rootsweb's lesson 10 has a good article on newspaper research, as well as links to major collections of international newspaper resources.