Even better, there is no jailbreak or shady business required to pull this off. All you need to do is download Apple’s free iPhone Configuration Utility. Normally this tool is used in enterprise environments to aid in installing apps and configuring policy profiles.
Once you purchase the app and connect your iPad to your computer, you can use the utility to manually copy iPhoto or iMovie from your iTunes’ Mobile Applications folder in the Configuration Utility library. Once the apps are listed in the library, simple click the Install button for each app and you’re on your way.