Welcome to the Mac! Indeed you can use iListen with Scrivener. I am a longtime iListen user and can definitely recommend it. The new version [1.8] has very good recognition accuracy. I do have to admit that in terms of vocabulary and correction, the Windows-only product Dragon Naturally Speaking is better, but iListen has the great advantage of complete OS X integration. With iListen, you can indeed speak anywhere on the Mac – and you can create commands to control any application. When I have longer texts to dictate, I do sometimes create the documents on a PC that runs only Dragon Naturally Speaking and DarkRoom (a simple full-screen text editor) and then drag them into the Scrivener binder, a setup that also works quite well.
There are two threads on voice recognition software that may be interesting to you:
All the best,
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