If you're someone to whom networking comes easily or have extensive experience in attracting new clients, some of this material may not be new to you. However, if you're not that comfortable with finding new clients and you're looking for a system flexible enough to accommodate different approaches, this is an extremely useful book. Harding is obviously an intelligent guy. The book is full of concrete, understated advice that you can actually put into practice---not hyped-up sales talk.
He does make one or two points that may be impossible to implement, such as "Specialize in something early in your career." Obviously you can't do this if you're well into your career. But he gives a lot of practical advice anyone can heed, for example, to update your bio after every major project.
He gives good advice about how to deal with journalists and get publicity, i.e., become a source. Don't promote yourself, just provide information reporters need to write their stories. Once you become a regular source, your name will be mentioned often enough. (He also has a good section on how to be quotable).
The single most trenchant observation is stated early in the book: networking is, first and foremost, about finding ways to help other people. It sounds a bit pollyanna-ish, but it's true, and if you keep this in mind, the whole networking process becomes much less distasteful and "slimy" to those inclined to view it as such.
An excellent business book, whether one is an independent consultant or working in a large firm.