I can't really speak to the content of the book or the other products linked to it.
As far as domain names go, the value of a domain name is mainly in it's use (or potential use).
Generally, unless you plan to spend big bucks marketing and advertising to make your brand recognizable, it's best to try and get a domain name comprising of common generic word(s), with their correct spelling.

If you have a big advertising budget, then this becomes less of an issue.
For example, eBay is not a real English word, however, through the magic of marketing, they've made their domain/website a "memorable brand".

As the the post above mentioned, you should avoid hyphens where possible.
One reason for this...people typically forget to put a hyphen when typing it in.