I just ran across this article on Redmondpie that demonstrated how to add and use iMovie on an iPhone 3Gs (which is supposed to be an iPhone 4 exclusive according to Steve Jobs) by editing only two codes in the plist file... Heres the link if anyones interested...

Link to the Article---iMovie Ported to iPhone 3GS, iOS 4 [Video] | Redmond Pie

iMovie Demonstration Video---
[ame=http://www.youtube.com/watch?v=N6L07nPrjzo&feature=player_embedded]YouTube - iMovie on iPhone 3GS and iPod touch on iOS 4[/ame]

Note: Im not trying to advertise another site, just passing along the goodies to the rest of the community.