I've used our Microsoft Library to read lots of .NET related books so far. However, most of them are fairly general and I find lots of the information redundant. I've purchased very few books, and I try and get only those that I think I will continue to use as a reference (google and codeproject as well as feedster have been my main source of how do I do this). However, the thing I like about this book is that all of this stuff is in one place. I don't need to bookmark a random webpage or Usenet post explaining something, or commit these things to memory. This frees up my brain to remember other things ;-).