I answered this somewhere else -- I didn't know this was the "popular" thread.
I put 100 books in my ticker because that was the name of the challenge and it was a nice round number that is a stretch beyond my actual goal.
My real goal was something higher than 65 since that was the number of books I read in 2009, the last time I kept track of my reading for a year. I think I am on track to reach that goal.