If you’ve got a site in Google News, you can now use Google Sitemaps.
“Freshness is important for news, so we recrawl all News Sitemaps frequently. The News Sitemaps XML definition lets you specify a publication date and time for each article to help us process fresh articles in timely fashion. You can also specify keywords for each article to inform the placement of the articles into sections on Google News”
Getting into Google News in the first place remains a bit arbitrary, however….