https://mleddy.blogspot.com/2005/05/tools-for-serious-readers.html

Interesting (now discontinued) reading list product from Levenger that in previous generations may have been covered by a commonplace book but was quickly replaced by digital social products (bookmark applications or things like Goodreads.com or LibraryThing.com).

Presently I keep a lot of this sort of data digitally myself using either/both: Calibre or Zotero.