Use QT Pro
I think you have to export the .mov as a DV stream to get them in to imovie, i dont have imovie installed so can't try it myself.
To take a section of the .mov with QT pro is very easy.
move the pointer to where you want the segment to start on the time line.
hold down the shift key drag the pointer 5 min up the time line. you will now have a darkend are on the time line between your in and out. Click and hold down and drag the movie image from the QT viewer to your desk top. you will now have a file called "Movie Clipping 1" that is the segment you selected.
do not delete the original file, as the clipping refers back to the original.
if you open the movie properties window & select time you will see the timing of the clips you have selected.
should take you 2 min, i will be quicker than convering the .mov to dv then in to imovie & exporting them again.