Having gone through the CS193p course, I decided to build a simple iOS app and take it all the way through to sale (for free) at the Apple App Store. Turned out to be a pretty painless process and my app is now live on the App Store. The app tracks the value of employee stock options using live stock data from Yahoo! Finance (retrieved via the YQL data table "yahoo.finance.quotes").
Here are a couple of screenshots of the app: