I’ve mentioned before the Griffin iMic as a way to use a standard mic with your Mac. If you are ready for the next step up, try the M-Audio Fast Track USB Audio Interface which provides a little better quality, input control, and other features. The only thing I don’t like about it is that it requires an XLR microphone connector, which is fine for musicians, but podcasters will probably need this XLR Adapter.
Related: MacMost Now 248: Using a Microphone With Your Mac, Can iMovie duplicate audio track to create a stereo effect?, MacMost Now 265: Making the MacMost Now Video Podcast, Locking a seperate audio track to your video in imovie, Capture audio from the video track and re-install that audio.
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