Today, new features became available for iOS devices after the WWDC 2011 keynote by Steve Jobs. Now, when you tap on the App Store icon, you will see a “purchased” icon.
When you tap on that icon, you will be able to see a list of what items you have purchased, even if they are not on your device. You can even tap to distinguish between iPad apps and iPhone apps.You can even display solely the apps “Not on this iPad.”
If an app is not on your device, a little cloud icon with a down arrow appears indicating you can download that app.
Overall, this improvement is a handy way to remember which apps you may have not loaded onto your iPad or remind you of an app you want to download.