Eric Lippert is a developer on the Visual Studio team at Microsoft. His blog is full of technical details of things like JScript, VBScript, COM, and BSTRs. Just the kind of deep arcane information that will either be fascinating trivia or life-saving know-how, depending on how deeply you work with these technologies.

He even has a write-up about COM threading models, which I may use someday if I need to understand the differences among them. Right now you have only to say “apartment threaded” to me, and I start getting cold shivers remembering bad experiences I had a few months back...