QUOTE(chrislynch @ Feb 26 2008, 11:06 PM)

You can today. Check out a little Media Center plugin called
MyNetflix. Well, you can stream videos that are Netflix Watch Now enabled from your Xbox 360 Media Center. Now, if the full library was available, that would be pretty awesome. And, if Netflix started to offer HD versions, instead of just SD versions, that would be icing on the cake!
It doesnt work on the 360 extender yet. I have it myself and others who have commented on the page you just sent also note this. He is working on it, but has not promised anything.