The stock market is now officially demistified because of StockTouch. Using color heatmaps, which are dynamic graphics that illustrate stock price movements, Visible Market's StockTouch for iPad nails making these maps both more useful, and simple to understand.
Some of my favorite functions are the search, a US/World stocks switch, settings for how you wish the stocks to be measured (including vs. sector or S&P 500, and the timeframe required) and displayed, and access to a list of your designated favorite stocks.
This scientific visulazation of the markets makes playing the market fun.
Try it out at: http://itunes.apple.com/us/app/stocktouch/id445170859?mt=8