A Commonplace Book?

I have just come across the term "commonplace book" and wanted to share it.  It is not a diary, but more of a journal dedicated to collecting literary fragments.  Perhaps instead of dogearing pages on all my books whenever I read a cool, quotable phrase, I should keep a commonplace book.  It would be better than the fragments of paper all over my desk and in my files!  Here's a link if you'd like to learn more.