There are a few things you need to do if you've just ambled onto the tour at this stage. First, you need to visit Christopher Hopper's blog, which got missed off the tour list and CH is probably too nice to complain. Which is a shame, cos he got a creative little competition thing going, which you've probably missed now, but do be sure to stop by there anyway.
You should also stop by a few of the other blogs on the tour (although, ironically, some of those on the list haven't posted...). Don't miss John Ottinger's offerings, which include both review and interview.
Then you should probably look at the book's website, the author's blog, and then check out Auralia's Colors at amazon.