Wow, anyone know if we can take advantage of this?
Sadly no... at present the only way to to run custom code on a 360 is with XNA.
...Or a media center plugin
One option is to use SilverSprite, it allows you to write games in Silverlight and have them work in XNA - http://channel9.msdn.com/shows/Continuum/SilverSprite/
I think that's XNA to Silverlight, not the other way around.
http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=108853
Cool.
Wee! Ads on my Xbox... I'm so... ex...ci...ted...???
Yep, maybe getting a little carried away with the technology there (Must be a geek I guess)