I love LibraryThing! It is such a great tool. The only thing i do not like is that you can only add up to 200 books before you have to pay for a membership. But, if i remember correctly they do offer a few different membership options, at very reasonable costs. (a lifetime membership for 25 bucks!) I don't use LibraryThing all the time, but i do log in once or twice a month. I like to see what my recommendations are, and i have come across quite a few books on my 'to read' list from those suggestions. There are so many things about LibraryThing that are awesome! I will continue to use LibraryThing in the future.
Here is a link to my librarything catalogue: