I know some of you guys make bitcoins and some of you buy them. Regardless of that, and even if you never use them, you have to see this. This website lists all the bitcoin transactions, and even the bitcoin blocks. High tones are tiny transactions, and low tones are high transactions. Just leave it running for a few minutes, it's really cool. Each bubble you see going past is money they just made. If you wait long enough, you'll see a block, I saw one go past. It's awesome, just give it a spin. http://www.listentobitcoin.com/
Bitcoins are like an internet currency, (example : http://bitcoinshop.us/), every time someone buys something with bitcoins, or trades Dollars for Bitcoins, a bubble appears.