This will be a great way to record the books read, book I want to read, etc. I can see many uses for this. I like that you can save notes, too.
Just as a reminder (as per the release notes: http://five.logos.com/Logos_5.0_Alpha_3), Bibliography documents saved in this Alpha will be deleted in an upcoming release (due to planned code changes).
Annotated Bibliographies! W00T (I'm still downloading so I'm celebrating vicariously)