Why the switch? Money and traffic. The shadowofgreatness.com site was due a yearly renewal for $96. The site was only averaging about 10 visitors/day, though, and many of the features – our book tour, blog, media events, etc – were either not viewed or out of date. $96 isn't a huge amount of money, of course, but it didn't make sense to pay it when we have a class site that can host the pages we want to describe the book.
If you come across any old links that fail or other weirdness, please let Pat McConnell know so he can fix them.