Was kinda expecting a visual poster with all the book covers or spines. Granted you'll have to replace or extend it over time as your ebook library grows, but it would be a nice way for visitors and yourself to browse through your books.
Just create an account, add the books you have/are reading to the poster via a search menu and print! There's a little QR code on each poster so your friends can scan it with their smartphone to discover all the books you own.
Vision Directory
Hustle X
Mibo
Startup Stash