YouTube / CBS streams live basketball games with Microsofts Silverlight. An example here:

http://www.youtube.com/marchmadness

Ewww...

Will HTML6 perhaps have a streaming standard like HTML5 does video?

Oh by the way, that Ewww was for:

1. Siverlight
2. The Un-YouTube-y look of the player
3. All of these One-off Partnerships YouTube has going...

more Ewww:
Silverlight 2.0 – No Linux support as Moonlight only supports 1.0
IFrame – Why not embed it?