Howdy pard,
I too love my Nook, my wife got hers first due to artrithus she was having troubles with her hands and "real" books. Then we goot me one a couple of months later. Love it, just had my Nook Color replaced under extended warrenty with a Nook Hd, miss my Nook color due to features.
As to free books, B&N has free book Friday where they give away free ebooks, apps and movies. Also if you search free nook books at
www.bn.com you will find 100,000's to down load. I have found a bunch of gems in there. A lot is a matter of filtering. Need help with trinks let me know and I will post some more.