I don't want to discourage anyone from using this forum to discuss the Professional DotNetNuke book, that's what it's here for. But you should keep in mind that there's already a great community devoted to DotNetNuke at:
There are probably a lot more DotNetNuke users and team members there who will be able to answer questions, and answer them more quickly. But we'll do our best to help here too.
Senior Acquisitions Editor
Wiley Technology Publishing
Jim's Book of the week: Professional DotNetNuke ASP.NET Portals