I very recently came across LibraryThing.com. It is one of the most convenient methods to catalog the books. Fast and Easy.
After getting a free account, all you need to do is enter the title of the book in the window. The website would search through the amazon databse and come up with matches. You select the book from the results of the search. And the book gets added in your database.
Another good feature is the cover image. The website would also fetch the image of the cover page of the book and publish in your catalog.
An indicative list of my books is located here.