David McCandless, at Information is Beautiful, has a great visualization of spending on a variety of things at his Billion Dollar-O-Gram.  It is a great way to compare spending on the Internet Porn Industry with foreign aid given by the world's major nations (about equal) or the total cost of the financial crisis to the US government ($2800 billion) to the value of Africa's entire debt to Western nations ($200 billion).  Enjoy!