Audio and video not in sync when exporting to Quicktime file

I use a digital camera to shoot video, which is in .avi format. I then import the clips into IMovie HD (selecting all the clips and dragging all at the same time into IMovie). If I play the video from beginning to end in IMovie, the audio and video line up fine. But, when I 'share' to Quicktime file, the longer the video is, the more out-of-sync the audio and video become.
I didn't have this problem when I used a mini-DV cam and imported using a firewire cable (in real time).
Any ideas as to how to get the audio to sync up with the video once it's shared as a Quicktime file? I've tried .mp4 and .mov, and I have the same problem.

Anything here help?
iMovie: Improving audio and video synchronization
http://docs.info.apple.com/article.html?artnum=42974

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Adio and Video not in sync when exporting QT Movie

Hi guys,
I'm having a very strange problem here. I'm using FCS2 and have edited a sequence in FCP using HD720p. In Final Cut Pro, everything is fine, I can play the sequence and the adio matches the video as expected.
When I export the sequence to a QuickTime movie, the final movie has the adio way out of sync from the Video. I have searched through this boards and noticed some other users having the same problem, but couldn't find a solution for it.
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Hi,
Well, I could try, but I'm not 100% sure that this was the exact source of the problem.
The source media where Screen Captures taken with iShowU, which I was going to use to create a video podcast with. The ScreenCast was recorded using the HDTV 720p codec with 25 frames and 44,0 KHz audio. I imported those clips into FCP6 and noticed that the Sequence preset had 48,0 Khz audio instead, so I imported every source clip into Soundtrack Pro to convert the audio back to 48,0 KHz.
I guess that is where it went wrong somehow. Since at some point FCP indicated that one of the source clips had 44,0 KHz audio and not 48,0 KHz audio ( though in SoundTrack it reported 48,0 KHz ).
I imported the stuff back into FCP and noticed that now the audio of the clips was 48,0 KHz audio, so I was ready to go. I did the cut in FCP and audio was perfectly in sync with the video. Upon export to a QT Movie ( Self Contained or Reference, immediately from FCP or through Compressor 3 it didn't matter ) the sound seemed to be out of sync after a period of time. By the end of one 15 minute clip the sound was about a minute off, which is unusable for a screencast.
Thanks to a suggestion here I exported the original clip from within FCP to a new QuickTime movie containing only the audio, and one containing only the video portion. I dragged those two on a new Sequence and did the cut again.
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For what it's worth, I'm having what looks to be the same problem. Driving me insane. Here's what's going on-
Editing in FCP 6.0.2
QT was just updated to 7.3.1 the other day (hmm)
On an MacBookPro machine, OS 10.5.1
Software updater says everything's up to date of course.
DV-NTSC 24p (23.98) Advanced Pulldown Removal (footage was shot at 24PA on a DVX100b)
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Audio and video not in sync when exporting to Quicktime file

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