I really like the design and the interface, nice work. One thing I found a little confusing is that if you go "back" and then "forward", the "forward" action seems to load a random quote instead of returning to the one you were on.
It is confusing. I wasn't sure how to keep the interface as simple as possible and also include the forward functionality. I'll be putting more thought into this for the next iteration.
I had a similar weekend project - http://kidactivityideas.com - where I had a similar issue with "randomness". I decided to save the pseudo-random generator seed in a cookie and thus keep the sequence for each visitor.
