Also, this forces me to look at and consider every single book, and will hopefully keep me conscious of the things I buy in the future since I'll have to keep up my list. I should also find out how many other duplicates I've accidentally accumulated besides The Left Hand of Darkness. It has also inspired me to start a pile of stuff to sell back to Half Price, since some things I looked and honestly wondered why the hell I had them.
Thirdly, I will be able to brag about my library to other people and show everyone how leet it really is. :) I was a little bummed that some of the editions I had were too old to be listed, so I had to simply substitute a more recent printing.
So far I have 89 books in there, and that's just the first short bookshelf mostly consisting of graphic novels, computer stuff, and mass markets. When it's all done I should be able to list them by tag (super handy), title/author data, popularity, etc. What a great website!
EDIT: meh, so I lied. I've gone ahead and started with the tarot drawer and the occult bookshelf, and filling up my 200 alotted slots tonight. Whee!