Not many people are brilliant writers and also have the technical knowledge to comment on file formats intelligently. When it does happen, it’s worth reading. So I recommend to you Why Microsoft Word Must Die by Charles Stross.
I’ve been on a digital preservation panel with Stross, and he can talk as expertly on the subject as I can. When it comes to Word, he knows a lot more about the format than I do, and he can demolish it more eloquently than I could even if I had the same level of knowledge.
Mad File Format Science 