UPDATE (7/16/2008) added a Zune distrubution from community user 'LedZepp'. I have not tested the code yet but trust it works.
From LedZepp's email: 'This is only for the zune though, I took out pretty much anything that had to do with silverlight or Windows.'
UPDATE: I've uploaded new Silverlight Files to support Beta 2. I've also uploaded a build for the XNA 3.0 CTP. This was put together by Jeremy Bell from the forums. I havn't tested it yet so use at your own risk. I'll do a more formal release once Silverlight and XNA 3.0 are finalized.
This version supports Silverlight 2.0 Beta 2
For the XNA version with samples, be sure to select a platorm prior to trying to compile. You select a platform from the drop-down on the Visual Studio menu. It usually defaults to 'Mixed Platform'. Choose x86 for Windows.