I'm so glad I read this thread. I have no trouble downloading books using Nook for PC, but haven't been able to Alf them since I updated my credit card late last year. In my case it just meant I didn't buy e-books from B&N anymore. I wonder if they have any bean counters doing a cost benefit analysis on sales lost due to their updated DRM scheme?
Spent some time yesterday downloading Nook Study, imported a book into Calibre and bang!, B&N and I are dating again