i'd go with iMovie HD 6 which you can download here http://www.apple.com/support/downloads/imovieHD6.html if you have iLife '08 installed... iMovie '08 is missing a lot of a good things its predecessor had... I don't have any experience with Adobe Premier though
I would also go with IMovie 6.
ok as i said before iMovie 6 is not part of the descussion. I tryed it and it is not close to iMovie 8 in speed and control. The Question is how will Adobe Premier 6.5 compare.
I think comparing Premiere and iMovie '08 is like comparing chalk and cheese. Adobe Premiere is a more expensive video editor and quite frankly if you were looking at getting it to replace iMovie '08 I would say don't bother and get Final Cut Express or Final Cut Studio instead (depending on your budget). Both of which are fantastic video editing packages.
no its not to replace it, im not planning on buying anything new, well i am getting final cut express for myself neerer christmas but that is not part of the disscution. What i want to know is for making a 30 minute video as professional as possible what is better to use iMove 08(not 06) or Adobe Premiere 6.5(only 6.5).
As far as I am aware Premiere 6.5 is not a universal binary so with that in mind I can safely say without a shadow of a doubt it would be iMovie '08. If Premiere 6.5 is a universal binary (I really don't think so, if it is older than a year then it definately is not) then you could try using that although I think you would find iMovie '06 better than Premiere for usability.