David Romhan Torres has succeeded in getting iMovie to run on his iPhone 3GS with little difficulties.
I just make iMovie for iphone 4 run on an iphone 3GS, it’s very simple just download the file, modify info.plist file and change the Minimum system version to 3.0.0 and UIRequiredDeviceCapabilities/front-facing-camera to false

Take a look at the video below posted by RedmondPie. They’ve posted some instructions as well; however, the installation of the modified ipa requires circumventing Apple’s DRM so we can’t post a full tutorial.
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Related posts:

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  3. How to install iMovie in iPhone 3G S (Mac)
  4. How to Use iMovie on the iPhone 4
  5. Spirit Jailbreak Fix for iTunes 9.2 on iOS 3.1.3 and iOS 3.2

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