The Wal-Mart app for iOS does a great job laying out shopping categories for its huge inventory, letting you browse to items quickly. The interface includes categories on the left navigation bar that let you drill down to specifics, and a bigger window on the right to view results.
The Wal-Mart app takes advantage of the iPad's screen real estate well, by keeping navigation and viewing windows all on the same screen. Once you've drilled down to a category, you can get more product viewing area by swiping the navigation bar to the side. Then you can swipe up our down to view all the listings in that category. We really like how the app is logically laid out, allowing you to switch gears completely midsearch and start over in only a couple of touches.
The app has a few handy extras as well. You can sign in to your account for easy purchasing, set your local store to find out the deals associated with that location, and even get directions on a map to the store of your choice. This is particularly helpful if you want to line up some deals before running down to your nearest location--handy when you need a gift fast.
Overall, the Wal-Mart app is a great way to shop on the iPad with tons of categories to browse, an easy-to-use interface, and tools for finding nearby bargains. If you're a Wal-Mart shopper and want to browse items on the iPad, this app is perfect for the job.