at http://www.google.it/support/news_pub/bin/answer.py?hl=en&answer=74288 google wrote:
# A News Sitemap can contain no more than 1,000 URLs. If you want to include more, you can break these URLs into multiple Sitemaps, and use a Sitemap index file to manage them. Use the XML format provided in ...
max num of entry is 500 in my plugin. Google giva a maximum of 1000 entry... for me is best a minor number of entry in the time, who submit 1000 news in a week?
However the other very important thing is to create a ...