Google Books
I've started adding my books to my library on Google Books. You can take a look here: http://books.google.com/books?uid=655440628149996981
I like how I can usually add the exact edition that I have with the correct cover art. Unfortunately it doesn't seem to have many of the UK printings that I have of books by Douglas Adams and Terry Pratchett, for example, which have the best cover art. However, most others are there.
Later I plan to go through them all and tag them, rate the ones that I remember, and re-read the ones that I don't.
I like how I can usually add the exact edition that I have with the correct cover art. Unfortunately it doesn't seem to have many of the UK printings that I have of books by Douglas Adams and Terry Pratchett, for example, which have the best cover art. However, most others are there.
Later I plan to go through them all and tag them, rate the ones that I remember, and re-read the ones that I don't.