How big is your backlog?

Okay guys, let's be honest. How many books do you have waiting on you?

Personally, I love buying second hand books. Not only is it more efficient and cheaper, you never know what you are going to run into. I do however buy these books faster than I could possibly read. I just checked my shelf and I have 53 books on my to do list. Although I aim to drastically reduce this amount, I do like the wave of anticipation that hits me when I am close to the end of my current one, figuring out which one I am going to read next.