Philipp Lenssen has an excellent write up on How Google News Indexes. He goes through how news sources get included, how news stories are clustered together, which sources get found on the Google News home page, and then some other tips. Philipp also explains how the news breaking source normally gets the top spot in the results and how to create content specifically for Google News. This can make a very useful and interesting read for anyone interested in Google News.
I also wrote about Submitting Your News Site To Google News back in June.
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