LibroSpot is an online initiative that is self-described as “a simple way to tag, save, manage and share books from Amazon.com”.
This is a good a definition of the services on offer as you can get.
Basically, the site intends to improve and further the way people discover, remember and share books online. The LibroSpot website acts both as a sort of online book shelf as well as a wishlist that will enable internauts to keep track of the titles they wanted to read. It will also come in very handy as a resource for book reviewers to have access to the titles they need.
The site boasts a search engine that will enable you to look up books by title, author or ISBN number. For its part, recent updates are spotlighted on the main page for additional browsing convenience.
Registration is accomplished online in a simple manner, and if you happen to already have a Google account you don’t even need to register – you can log in using it instead.
LibroSpot.com In Their Own Words
“LibroSpot is a simple way to tag, save, manage and share books from amazon.com”
Why LibroSpot.com It Might Be A Killer
It acts both as an online bookshelf and wishlist.
Some Questions About LibroSpot.com
Are there similar online services? What features will be added in the future? 
