A major update for the Nook reader for Android has been released: http://www.zdnet.com/blog/cell-phone...d-storage/4403. Most importantly you can now read your own DRM-free EPUBs by putting the book in the Nook's folder ("sideloading").

Perhaps someone can check if DRM'd EPUBs (e.g. from enTourage or other Adobe Digital Edition sites) work, too.