User_None, are you on a Mac?
As I understand it, B&N is transitioning to EPUB exclusively and anything you previously downloaded as a PDB can be re-downloaded as an EPUB.
What I've heard is that if you're downloading to a PC or a Nook, you already get EPUBs automatically.
But if you're downloading to a Mac, you will often get PDBs because the old eReader for Mac desktop app sometimes has trouble with EPUBs. (However, now that there's a beta version of Nook for Mac desktop app available, Mac users will probably start getting EPUBs instead of PDBs soon.)
To get an EPUB when downloading to a Mac, change the User Agent on your browser to mimic a PC. You can do this in Safari by going to the menu bar, choosing Develop > User Agent, and selecting Firefox for PC or Internet Explorer.
I haven't tried this on every single book that B&N sells, of course, but so far, it works for every single book I've bought from them.
If you're on a Mac, I'd be interested in knowing if your experience is the same as mine -- i.e., downloading to a Mac results in PDBs, but changing the User Agent to mimic a PC results in EPUBs.
Last edited by Jane12; 05-29-2011 at 08:00 PM.
Reason: for clarity