NASA TV streams many different feeds to the web. Viewers can see images from the International Space Station, educational content, mission control video, press conferences, and more. Today, through Tekzilla I learned that NASA TV can be viewed via a Windows desktop widget. Watch the episode of Tekzilla Daily embedded below to learn more about putting NASA TV on your desktop.

Here are some related items that may be of interest to you:
NASA Space Place – Where Science is Fun!
NASA Images – Embed Galleries of Images and Videos
Video – Space Shuttle from Hangar to Launch