The news had rather passed me by I am afraid, but the BBC's IPlayer has been offering streaming video since December.
It's an intriguing development and means that you can watch Wales beat England again and again here, (well at least for one more day). I imagine that the Wales Scotland game will be up over the weekend.
From what I can gather, flash is the video format used. The BBC doesn't offer a straighforward way of embedding moving pictures in blog posts like this. It shouldn't be beyond the wit of man to hack one though. I may try and have a look at it, time permitting.