We have a lot of demo for silverlight which can be used for moonlight.
And Vladimir have done a demo to show that SVG can done the same thing and is fully open source.
Even if MS is behing SilverLight it is open source for main part and remake for other part.
So you can compare it here :
It is really slow but works and now silverlight:
To conclude, it is quite the same thing even if Silverlight/moonlight have more image and is a lot faster. So SVG need a real performance improove to become usable in web development.