Well if you were using premiere Pro 1.5.1 , the mov files would go to My Pictures file from a Canon EOS 5D mark II and you would then assemble them on the timeline and then render to edit.
Good luck
In addition, note the files will be jittery if left unrendered, if you have 25 minutes of mov. H264 files it could take 4.5 hours to render using a Pentium 4 3.23Ghz @88FSB and only 2 GB ram , your computer should cut this time by 80%. Note. The mov. H264 files played back on a Sony 46″ bravia in HD are simply stunning, ie., Exported to Tape , you may have to try Bluray