As a professional writer I agree with the condemnation of the something-for-nothing approach to acquiring books, as described in another post. It's also interesting that the poster resorts to vulgarity and insults when challenged.
With regard to "beta" versions of your books, I would be interested in going on your list. I am just a journeyman .NET programmer but I do bring long experience in professional writing and editing.
Best wishes to the new Wrox.