Ever wondered what a $10,000 bill looks like? This Bureau of Engraiving and Priniting page  shows you pics of $10,000, $5,000, $1,000 and $500 bills! All of the bills on this page haven't been issued since 1969 (which explans why, in crime shows, they always demand the ransom in $100 bills).
On the same site I found this very interesting page  that has interactive Flash explanations  of the changes to the $10, $20 and $50 bills. Your tax dollars at work!