Sam mentions his COM Interop article series has begun on MSDN. The first installment “Has Anyone Seen the Bridge?” gives an overview of why bridges are needed between the COM world and the managed (.Net) world. I had the pleasure of seeing some early drafts, and I know this will be very helpful to many developers who have wrestled with COM Interop.
As Sam told us at work, the title of his first article is part of a famous song. Your guess?
UPDATE: Even today, at work, someone was having problems with their first COM Interop app crashing, and used Sam's article with the Marshal.ReleaseComObject call information to fix the problem.