"A billion here, a billion there. Pretty soon it starts to add up to some real money."

"President Bush asked Congress for an additional $87 billion dollars for the next fiscal year, to continue the fight on terror in Iraq and Afghanistan. But $87 billion is an impossibly high number for anyone to visualize. Let's have a look...."

See also an old favorite, The Megapenny Project.

Update: Also, "How Much is Inside a million dollars?"