I have tried a half a dozen similar apps and honestly none come close. You can scan your library or manually enter it so you can have a record of it. You can keep track of books you want, are reading, or have read. In fact you can link to stores and downloads right from Goodreads. You can see what your FB friends are reading, if they're signed up, which helps keep you up on both trends and classics. Every time you read a book you see reviews--some of them insightful and educated reviews. I'd recommend Goodreads over pretty much any other personal library or reader site.

This is a great game for keeping one's mind sharp. There are several types of puzzles and increasingly difficult levels. However, some levels simply will not track one's score for whatever reason. I've beat my own times and my score will not budge, so some glitches are yet to be solved. When and if said issues are solved, they can count of five stars from me.