Microsoft has shipped the Beta 1 version of the Monad-MSH shell. You need to have .NET Framework Beta 2 loaded as well. I'm downloading now!
[later that night...]
Well - I've got it downloaded. There's a good 74-page getting started document, which mirrors Jeffrey's outstanding TechEd talk (which was 5th highest rated overall!). I certainly recognise the flow! It's time to start self hosting.