8. Google Finance
The simple mission of Google Finance is to track stocks. The app also comes with a widget that allows you to quickly glance at the performance of a single stock or index in a little 2x1 widget. You can have use multiple instances of the widget to track multiple stocks.
If you'd prefer to view this as a list instead of a photo gallery, then see the companion blog post.
Jason Hiner is Editor in Chief of TechRepublic and Long Form Editor of ZDNet. He writes about the people, products, and ideas changing how we live and work in the 21st century. He's co-author of the book, Follow the Geeks.