Nice little bit of new functionality from Google - you can now star particular news items that interest you, in the same way that you can star Gmail or GReader content. If you run a search (or simply open up the news page) you'll see little starts next to the stories:
If you star an item it turns yellow, as you can see above. It's important to note, as the Google News blog post explains, you're telling Google that you're interested in the story, not the specific news item. If more news stories come up about the same subject area Google will highlight this by emboldening the headline for you.
You can also see a listing of all the stories (up to 20) that you can have starred at once.
If you don't see the above left menu on your screen, don't worry, it is there. If you check the first screen shot, you'll see a link to 'More sections'. Just click that and you'll get the menu as you can see to the left.