iTunes Account - Share iPhone Apps and Other Content
Despite Apple's iron hand when it comes to what you can and can't load onto your iPhone, iPod Touch or iPad through iTunes, there's a feature of the multimedia gateway that's surprisingly liberal. Any downloaded or purchased content on iTunes can be synchronized, and essentially shared, across any number of devices -- so long as they're all linked to the same iTunes account. This will allow you to share iPhone apps, games and other content.
By signing your computer into an iTunes account, you can purchase and download music, videos, TV shows, games and applications onto the computer, and then synchronize it with your iDevice. The same is true in reverse, and any content acquired directly through the iPhone or iPod is transferred to the computer during the sync process.
You can also synchronize as many devices as you want with iTunes, and all the content from the different iPhones, iPods, iPads and the computer is replicated across the board without the need to purchase it again. This is particularly useful for families whose members each have their own iPod, iPhone or other Apple device. Buy once, and share the goods.