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Title: COM IDL? Its all in here
Review: This is definitely the COM IDL reference book. There aren't many books devoted to the subject and most COM books focus on the technology from a specific language perspective not spending any time on IDL itself. Frankly I can't say that it has helped me a great deal with everyday development but it certainly has made my understanding of a few things much clearer and it has reinforced some ideas I had that I was not sure of. Like other reviewers I did not find the other half of the book to be of great value but it was interesting to compare (partial) implementations of the same design in 5 different languages in the same book. My final praise is on the excellent comparison of the various IDL types and how they map to the various languages including a discussion/description of the ubiquitous SAFEARRAY.
