I just measured my dead-tree tech shelf -it's ~5 linear feet of programming books, 700-page O'Reilly tomes on Python, Perl, LAMPP stacks. This slim volume is packed with more tech punch than half of them. Its platform-agnostic approach succinctly explains *how* to approach the primary problems you'll encounter when faced with a messy spreadsheet you need to transform into a clean, maintainable database. Personally, it's even better because I work on scientific databases, the author's forte; usually I have to wade through a swamp of business application stuff (not that this book *isn't* applicable to that). Excellent.