Tracey,
Have you had a look at the reviews on Amazon.com for his book? Those are uniformly some of the more impressive reviews I've seen for a self help book.
If you press the link "Get personal coaching now" on his web site, you will see that they offer a monthly program on CD-Rom for 49.95 a month, with a money back guarantee.
I've got the book too, but I bought about fory books along with that one, so I haven't finished it yet. You could of course get the book first and then decide if you want to get the CD-ROM course. I'll go for it myself, I think.
Dan gets good reviews from individuals and businesses alike. I think he is one of the more serious people in the field.