Inking on Video with Silverlight

Silverlight Tablet PC Ink Annotating Microsoft’s Stefan Wick continues to pump out some great Tablet PC ink and Silverlight stuff, this time delivery some ink video goodness, along with a sample app and a sample for you to try on his blog. Check it out:

Silverlight makes delivering video content in the browser very easy. Silverlight also has ink support built-in. So why not combine these two features to enable some great new scenarios?

I have put together a little sample using Silverlight v1.0 to record and play back ink annotations, synchronized with the video playback.

What are some great ways that annotating / inking on web-based video could be used?