How do I share my Nook Books with other Nook users?

This is easy to do.  Go to your Barnes and Noble account, and find your Nook's library.  Books available for lending will have a Lend Me icon.  Click on the Lend Me icon for the book you have selected.  This will bring up a window where you can type the email of the person you wish to lend to, as well as a message.  They will receive an email alerting them that a book is being lent to them.  The book can then be downloaded.  Books can be lent out for 14 days.