Bloomberg: Visualization Tool for Financial Data
Another highly complex app that does a good job of making the information accessible, the Bloomberg visualizer (free) shows data for equity indexes, bonds, futures, commodities and currencies, along with breaking news and info about the debt crisis.
You can also track your personal holdings and use tools such as Leaders & Laggers to help you with investments. The app also lets you browse video and audio clips. The home page gives you a quick snapshot of performers using color-coded queues for stock prices.