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So you have a Nook and you're looking for some places where you can borrow and lend books. Here are some of the sites I found and participate in.

bookfriend.me
http://bookfriend.me/

I have a NOOK and I'm willing to share books!
Facebook group
http://www.facebook.com/home.php#!/group.php?gid=122848187733477

Barnes & Noble Nook
goodreads group
http://www.goodreads.com/group/show/26013.Barnes_Noble_Nook

Nook Chick Lit Lending Group
goodreads group
http://www.goodreads.com/group/show/38894.Nook_Chick_Lit_Lending_Group