If you have ever done cite-checking with newspapers you know how difficult the process can be.  In many cases, students must use microfilm, or microfiche, to verify newspaper citations.  Google has announced a new project where print versions of popular newspapers will be available and indexed.  The project is starting with major newspapers (NY Times, etc.) but should expand quickly.  The project may be of limited utility, due to the its present size, but presents a huge step forward in improving the cite-checking process for newspapers.

News Archive -- Google (incorporates Google Book Search and news archives, include a timeline view of sources)

Bringing history online - one newspaper at a time -- The Official Google Blog

We're on the Moon! -- sample article from 1969 Pittsburg Post-Gazette