Thing is some times Google has blocks on specific sites, I have noticed this with sports betting and gaming sites in the past. Sites may be accepted a few years ago.
Also from my experience you need very high quality content and you need to be producing content at a fast rate.
A good post from the SEOmoz blog can be found here, about getting into Google news:
http://www.seomoz.org/blog/how-seomoz-gained-1000s-of-visits-from-google-news
