Senkwe Chanda --> Charlie, would it be possible to get my hands on the source code for that last demo with the spinning letters?
Absolutely! We posted the Alphabet Soup sample (and a couple of others) when we introduced Windows Media Center Presentation Layer Web Applications. Read the blog post at http://blog.mediacentersandbox.com/PermaLink,guid,cb622812-d80f-45d2-82d6-a54099e62e21.aspx for a pointer to the Alphabet Soup source (it's readable XML in your browser).
PerfectPhase --> The first comment on the thread you reference above suggests that you will not be able to watch videos encoded with xvid/divx and the like on an xbox360/MCX device, is this correct?
Your statement is correct in that we don't natively support xvid / divx within Windows Media Center or Media Center Extender (for a list of the formats supported on Media Center Extender see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/MedctrSDK/htm/supportedmediatypesforthemediacenterextender.asp?frame=true).
However, there are a couple of community apps which have cropped up enabling you to watch xvid / divx on Media Center Extender: See http://www.brains-N-brawn.com/mceDivX360 and http://www.runtime360.com/ (the former was written by one of our newest Windows Media Center MVPs, Casey Chestnut).
Gotta love a platform.
PerfectPhase --> Is there a list of people making Media Center Extenders?
There should be over at http://www.microsoft.com/windowsxp/mediacenter/extender/default.mspx.
PerfectPhase --> Will the current crop of MCX devices be able to fully support Vista's media center? What sort of level will post be Vista RTM devices be expected to function at?
To be honest, I'm not on the MCX team and your previous question was about as deep as I can go personally with MCX technology outside of where it intersects with the platform piece. I'll see if I can get someone from the MCX team to join the conversation and give us some details on these questions.