Which Mac, which version OSX, which version iMovie?
Assuming the computer was med in the last 3 years, then it has an Intel CPU - and the OSX version should be fine... iMovie '09 *should work.
Connect the HF M30 with the USB cable to the Mac's USB port. Put the camcorder in PC mode. Launch iMovie. Capture the video.
That is how it works with my 2 year old iMac running OSX version 10.5.8, using iMovie version 8.0.6 - tough I prefer using Final Cut 4... with a Canon HF S 100.
If this does not work, when the HF M30 memory mounts to the desk top, you can always copy the MTS files from the camcorder to the Mac, then using a transcoder like MPEG Streamclip
http://www.apple.com/downloads/macosx/video/mpegstreamclip.html
covert the MTS files to MOV or MP4 files that iMovie can deal with.
If your Mac is newer, Apple has LOTS of support...
http://docs.info.apple.com/article.html?path=iMovie/9.0/en/mov39f84bc2.html
If iPhoto launches, just quit it before you use MPEG StreamClip or iMovie.
Hopefully, your Mac meets (better yet, exceeds) the minimum requirements (RAM, CPU speed, etc...) for dealing with the highly compressed MTS files the HF M30 creates.
Good luck.
I am not very skilled with either computers or camcorders, but my older Canon DC-50 minidisc recorder had a very simple connection via USB to my iMac. I upgraded to the Vixia because of the hard drive storage, but, if I understand the manual correctly, only still photos can be exported directly to a computer via the connections included. Is there an easily explained way to transfer videos from the Vixia to my iMac, using a wired connection? (I understand there is also a wireless option--is this any easier for someone not to techie?)

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