Confused by Canon HF10, iMovie '09, AVCHD and file size

Please forgive me for these (probably) basic questions, but right now I feel like a complete idiot.
I recently purchased the Canon HF10. At first I thought it was going to be great to have an HD camcorder (a reason to buy an HDTV, too) for home movies, but evidentially this isn't going to be as nice as I thought. I don't understand the following:
I basically want to shoot video of softball games and save for family use - nothing professional here, just good/great quality home videos. Also, need to be able to stop-action and step through video for softball skill analysis.
1. When I use iMovie '09 to import my video, it is taking forever to transfer. Why?
2. If the internal memory is 16GB, why is it taking up >100GB when I transfer it to my computer? (I don't get it)
3. What does the camera frame rate setting mean by i60 Normal or PF30 or Pf24? (again, I feel really stupid)
4. Is iMovie '09 the right app or is there something else? If something else, why? Again, I basically want to shoot video of softball games and save for family use - nothing professional here, just good/great quality home videos. Also, need to be able to stop-action and step through video for softball skill analysis.
Thanks for understanding my lack of knowledge and all your help and insight is appreciated!
SP

Regarding stop action, this camera has the ability for you to take stills while video is recording. It's pretty interesting. Even better, iMovie lets "Add Still Frame to Project." Also if you play video from iMovie Project or Event window's, you can easily view one frame at a time by repeatedly pressing the left or right arrow.
Hard disk storage is cheap now, save up and buy a drive to archive your video. That way later on you could re export your movies to an HD compatible format since burning to DVD as your doing now is not HD.
Also, yes definitely use 60i for action video. This camera really does a great job.
The thing about 30p/24p with this camera is that the resolution is reduced: 60i=1920x180 pixels whereas 30p and 24p modes on this camera is 1440x1080.

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Confused by Canon HF10, iMovie '09, AVCHD and file size

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