Quite simply ... if you work designing solutions for the web then buy this book and, more importantly, read it.
I've worked on the web for over 15 years, mainly websites, and read voraciously in that time about content, IA, UX, users, etc. etc. and yet this book blows away all the so-called expert advice, axioms and preconceived ideas that one gets handed about users, information architecture and content design in one fell swoop.
Basically, McGovern's "top tasks" methodology is a practical and evidence-based approach to web solution design that is both simple and straightforward to apply, and yet works beautifully for large-scale information-centric websites. In particular, I love the idea of "continuous improvement" vs "launch and leave", and here is the evidence to prove that the former wins out in a world dominated by the "quick fix".
And while the concept of data-driven design is something I have been toying with for a while. McGovern's ideas take us back to basics by showing us that we have still not solved the problem of ensuring "findability" on the web, and in an engaging way he gives us practical and content-centric ways to do just that.
Remember .... Buy it, read it.