Oooh... now that's clever....

"According to The Guardian, Microsoft plans this year to make programmes and films available in high definition based on its Silverlight tech. But Redmond clearly isn't brave enough to apply its own proprietary software to the rest of its MSN video estate yet."

So the plan is to use well established technology so that people can use the site immediately, so aren't scared off. Then use enhanced content as an incentive to install the otherwise-unnecessary Silverlight player.

Increased complexity in the server farm, but it will drive uptake.