Timo, you are right regarding the WROX books.
Yet we do not look at the DotNetNuke books as WROX books. They are DotNetNuke books. And it is in the interest of everybody here, present and future, that they are as free of errors as possible, and have quality reader feedback.
WROX is a big and respectful company. We like them. My shelfs are full of WROX-printed books. Yet they obviously do not care enough about error corrections in their printed books. If they did, they would have created an effective user interface to report errors. Just try it once and you will redefine frustration.
The DNN books add value to the DNN environment. You will certainly agree that feedback (like Geoffrey's observation of the problem with DNN, Visual Studio 2008 and VB, page 357 of the DNN 5 book referenced in this thread) and forum discussions related to these books are adding more value to DNN.
It is in the interest of the DNN community, book readers, DNN, and the book authors to get these things right.
All the best.