Silicon Valley Insider reports that CBS News has signed a deal with Mountain View-based Ustream.tv to begin streaming all of its “Evening News” broadcasts and breaking news reports over the Internet. UStream.tv is a service that distributes video over the Internet. Here’s how Ustream.tv describes itself:

Ustream.TV is the live interactive video broadcast platform that enables anyone with a camera and an Internet connection to quickly and easily broadcast to a global audience of unlimited size. In less than two minutes, anyone can become a broadcaster by creating their own channel on Ustream or by broadcasting through their own site, empowering them to engage with their audience and further build their brand.

Nicholas Carlson of the Insider says one goal for CBS is to reach a younger audience. But another goal is to be in touch with Twitter users when there’s breaking news. When that US Airways flight landed on the Hudson River, a person on the scene uploaded an image of the floating plane to Twitpic and linked to it on Twitter. Quickly, hundreds of thousands of people rushed to see the image and talk about it. When something like that happens again, CBS News would have access to the image immediately due to its deal with Ustream.tv.

One more thing: The West Coast will now be able to watch the “CBS Evening News” live at 3:30 p.m. rather than waiting for the tape-delayed broadcast at 5:30 on KPIX 5.