I stumbled on this online community for book lovers, especially book lovers with a lot of books. It has been around since May 2006. You can catalogue your books, make and receive book recommendation, participate in group discussions regarding any subject matter that interests you.
The cataloguing process is very helpful for me. Type in the ISBN and the book information loads. You can tag the book and search to find it when needed.
You can catalogue up to 200 books for free. Unlimited for $10 annual or $25 for life. There are over 600,000 members.
Hope to see you there.