What's The Best Online Transcription Service?

Yesterday's post on Searching For A Collaborative Writing Tool elicited some great feedback and suggestions from y'all. It was super helpful and I've got a lot of things to try. For now, Amy and I are working in Google Docs (which was a suggestion from a few of you) but there are a couple of neat tools that I'll definitely play around with.

http://pulse.me/s/boLHF