I've tried downloading B&N eBooks but they shoqw up as .pdb format which does not import to my Sony eBook Library. Is there any way to download them in ePub format?

If there is not option to choose the type of format you down load then you will have to use Calibre to convert from .pdb (ereader.com or Palm format) to epub. If there is a DRM on the .pdb book you will need to have a look for a crack. If you have no luck finding one contact me as I have one that works. But it is a bit of a long winded process to get rid of the drm I have found.

If you download the same ebooks from within the Windows B&N Reader they may come down as ePubs. These are still not directly readable on your Sony, because of DRM, but see Barnes & Noble DRM for EPUB circumvented (http://www.mobileread.com/forums/showthread.php?t=66295).