The problem with your server producing empty white pages is that Silverlight 2 doesn't use MIME types in the same way as it did in the past.  So your web server tests work fine under Visual Studio but will break when moved to your production server, unless you change the IIS settings to handle Silverlight 2's files.  Long-story-short is that unlike Silverlight 1.1, Silverlight 2 doesn't compile a DLL file and you must fix the missing MIME type to display Silverlight 2 content on a production server. 

Here are two useful links on how to get Silverlight 2.0 content to work on production servers:
http://weblogs.asp.net/cschittko/archive/2008/03/03/silverlight-2-0-app-not-starting-fix-iis.aspx
http://weblogs.asp.net/mschwarz/archive/2008/03/07/silverlight-2-not-working-on-production-web-server.aspx

Hey All -- Sorry for the issues with Firefox and with downloads; I'm trying to resolve currently.  In the meantime, if you want to download the videos, I've got a post here with links to all the files:

http://www.rhizohm.net/irhetoric/blog/48/default.aspx 

I'm very much looking forward to viewing the WPF boot camp content, but unfortunately I'm having a few problems with it -

1) when viewing the videos directly on the page, and without maximising, the player controls obscure the bottom part of the video, and I can't find a way of removing the controls

2) when maximising, the bottom part of the video is blank

3) when maximised, the quality (at least of the one I looked at) isn't good enough to actually make out the text or graphics on the screen.

4) when trying to download, using the right mouse button on the WMV link produces a silverlight config context menu, rather than allowing a 'Save as' - this means the only option is to start streaming it by clicking on it normally, then use 'Save as' from the Windows Media player - but this prevents downloading more than one at once, and prevents use of a Download Manager program to queue up the downloads.

cheers