iPad and iPhone Apps
While both the iPhone and iPad can run many of the same apps there are apps specific to each device. The iPhone has apps that are specific to the iPhone, although most are not. Many of these apps take advantage of the iPhone’s phone or camera features.
The iPad also has many apps specific to the device. Many of these apps take advantage of the larger screen of the iPad (check out the Top Ten iPad Apps).
With that said, there are also many apps that are universal. They combine an iPhone version with the iPad version and the right version will run depending on the device you are using.
Speaking of apps, there are many preinstalled apps on the iPhone that Apple chose not to include with the iPad (ie. Stocks and Calculator). While these apps are not on the iPad there are many apps that can do the same thing or even more available in iTunes for free and for a price.
One current, soon to change difference, is the iBooks app on the iPad. iBooks is Apple’s ereader/bookstore app. Currently, it is only on the iPad. When the iPhone 4.0 OS update comes out shortly iPhone users who upgrade will have access to iBooks too.
Also, in the app category the iPhone has GPS and can take advantage of GPS apps. The iPad 3G also has GPS, but you need the Wi-Fi model to really take advantage of these apps and capabilities.