I've ported my "Tiny Abstract OS and CPU in C#" project from GotDotNet over to VB.NET.  I've also put up the PowerPoint deck from my presentation on this project at TechEd 2002 Malaysia.  The Tiny OS VB.NET version is up here.  (no warranty express or implied).  I had a little trouble with the conversion initially, but it went smoothly in other places.

Next step will be to see if I can get it running on my Linux Mono machine...