Jesse Kaplan gave a GREAT talk at PDC called Managed and Native Code Interoperability: Best Practices. I really enjoyed it, and it actually covers a great deal of ground. Sure, some of the diagrams expressed concepts I have expressed before, but that's a vote of confidence as far as I'm concerned.
This is a dense talk that assumes a fair amount of background knowledge, but well worth the hour to watch. And then he plugged my marshal-as site, too!
Dude, you had me at "interop boundary" and it just got better from there. But this was a great finish!