Managing Video Clips and HD Storage; Psychedelic stripes when iMovie freezs

I have read the posts on subj, but wanted to clarify the ff:
As someone suggested, good idea to save the original clips and just copy/paste them into timeline so that i can edit them as much as I want. Have done so but obviously taking up much space. Once I complete with my Project (but have NOT shared it yet with iDvd NOR imported them into iDVD):
1) can i now delete all the original clips in the Clips Pane? (it wont be like iPhoto where after deleting the pix, the pix are lost from the Books, or other projects?)
2) how do i save the original clips in the Clips Pane to a DVD. Do i use Export on iMovie? Or do i use Import from iDVD?
3) if I am working on several Projects, say Project 1 and Project 2, but want to use the Clips from Clips Pane in Project 1 in Project 2, how do I do that? In other words, can I make iMovie Project 1 as the repository of all my imported video clips (but not make any movie from it), then use those clips for iMovie Project 2, 3, 4 etc....... and how do I do that?
4) Further to #3, say I really wanted to end up with just one movie - say Europe Trip, but because I wanted to work on more manageable file sizes, I split them up so I have Project 1 say Paris, Project 2 say Italy etc. fearing that iMovie cannot handle too big file sizes. I was thinking of consolidating them all thru iDVD but what I expect would happen is that since I make chapters on iMovie, once I import Paris Project and Italy Project into one movie in iDVD, I will end up having two chapters or Chapter 1, two of Chapter 2, etc. Is there a way of avoiding that?
I suppose you an guess at my current predicament. My file sizes are just getting bigger and I have the same clips on Project 1 as I have in Project 2 and 3 when they all actually pertain to the same Europe trip that I want to make One movie on.
Finally iMovie often freezes on me and then the whole picture in the screen becomes one big colored zig zag stripes. I cannot playback or do other commands. The only way to get rid of it is if I reboot my iMac. I didnt have this problem before on my MBP. Could it be bec of Leopard in my iMac?
Thanks in advance to whoever responds.
Cheers
Raissa

It really shouldn't take very long to load video clips. It might take a long time to generate thumbnails the first time through, but from then on, it is lightning quick, because you are only shooting a few movies between times you open imovie.
While I haven't had the problem you describe, some other people have reported a similar problem.
Imagine a scenario where iMovie generates all the thumbnails and caches that it needs, but is unable to save them to disk. In this case, when you restart iMovie the next time, it would have to start from scratch and generate all the thumbnails again. This would certainly slow things down.
That scenario could happen if your disk permissions are in need of repair. You can repair permissions by using Disk Utility, which is in your Applications/Utilities folder. It is a good idea to repair permissions periodically, and certainly every time you update OSX.
I repair permissions every night as part of a script that runs when I do an unattended SuperDuper backup late at night. This is probably overkill, but at least I never have to worry about it.
Personally, I have several terabytes of movies in iMovie, and everything runs quickly. Most of my events are camcorder movies which are stored in iMovie. However, I have hundreds of short clips taken by still cameras, and I leave these in iPhoto.

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