I've recently discovered that Google has embedded a fun Flash data visualization tool in Google Docs. I've tested it out using data on the amount of buprenorphine (a drug used to treat opioid addiction) distributed from 2005-2009, by state. Grams of buprenorphine are shown both overall and adjusted for the number of opioid users in each state. The other variable is the supply of physicians who are licensed to prescribe buprenorphine adjusted for the number of opioid users in each state. Check it out.