Google Voice is the best of the free alternatives, but yes, there are much more robust voice transcription services out there. They're improving their software, but it wasn't originally built for general purpose transcription--it was originally written for Google-411, where its corpus could be much much smaller and more focused. If you notice, GV's transcriptions get phone numbers right almost every time. Cities, locations, proper names, it does all that quite well. It gets messed up mostly because it tries to find meaning in the random ums and ers of regular voicemail speech.
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