This is huge news for genealogists in central and western Maine. Google News Archive now has digitized copies of the Lewiston Daily Sun (1890-1989), Lewiston Evening Journal and Lewiston Journal (1861-1989), Lewiston Saturday Journal (1870-1929), and the Lewiston Sun-Journal (2005-2006).
Use the Advanced News Archive Search to limit your results to the Lewiston papers. Here are the links to search the Daily Sun, the Evening Journal and Journal, the Saturday Journal, and the Sun-Journal. Or just use this link to search all the Lewiston papers.
Update: Google now has links to browse these newspapers: