Here are two useful transcription tools for Mac users: First, there's Inqscribe, which lets you watch your footage and transcribe it at the same time. No more switching back and forth between applications, or using two computers. Haven't tested it, but it looks promising. Free trial for 30 days, then $69.
The second is Transcriva, which is an audio only transcription tool. Same as above, but no video. I used this to transcribe the Joe Swanberg interview from a few days ago, which I had recorded using my iPod and iMic. It works like a charm. Cost: $20.