Patrice Scribe is the guy who created the DirectX type libraries used by VB (and other) programmers from DirectX 3.0 through 6.0. He has a set of articles from 2003 about various aspects of Managed DirectX. The code is in VB.Net and there are short articles on Bounding volumes, scene graphs and others. Given the dates the code may not compile against the current SDK. Looks like Patrice hasn't updated the site in a while either.

I've been informed that Patrice is/was the owner of the yahoo group I mentioned the other day, I've tried getting hold of him through his website and the mailbox is full. So Patrice if you read this drop me an email.