Google News Sitemap Feed With Multisite Support plugin by timbrd dynamically creates a feed that comply with the Google News Sitemap protocol. There are no options to neither be set nor file or dir access rights to be tampered with and the sitemap become instantly available. Google News Sitemap will be reachable at example.com/sitemap-news.xml (or example.com/?feed=sitemap-news), ready for indexing by Google News.
Compatible with WordPress MU
Compatible with caching plugins like Super Cache, W3 Total Cache and Quick Cache that cache feeds.
Download and info: http://wordpress.org/extend/plugins/google-news-sitemap-feed-with-multisite-support/