I’ve started using Goodreads since it seems much nicer than other equivalents I’ve tested and also supports both Facebook, WordPress and iPhone, which none of the previous bookshelf-tools I’ve used before has done.

So far it looks great, just for fun I tried adding most of the books in my bookshelves (all that were available via Goodreads at least) and ended up with about 450 titles read, but missing most of my Swedish books which could not be located which is somewhat of a disappointment.