Check out the MySpaceTV "carousel" at the top of the MySpaceTV homepage. When you go to the MySpaceTV site now, you'll see videos at the top of the page that you've missed. As long ad you're logged into MySpace, and you have a subscription to someone's videos, you'll be able to see the MySpaceTV "carousel" at the top of the page.
See all the videos that you've subscribed to that you haven't seen yet. They'll all be posted there for you to watch. Whether you've subscribed to your best friend's videos, or someone you don't even know, you'll be notified of videos you've missed every time you go to MySpaceTV.