Application that plays audio file at double rate

I need to transcribe audio files and need an application that will play audio files at double their rate (and half their rate) so that I can quickly go through audio files and then concentrate on the pertinent portions.  Any suggestions of applications for Mac OS X?  Free is always good!

Dear Matt,
     Thank you for your suggestion.  I checked it out.  As I am transcribing portions of the files, I would like to just change the playback speed, not the actual file.  It seems like, in Audacity, you actually transform the file.  I noticed to do this you use "change tempo" to avoid pitch changes.  However, by modifying the file, the file becomes longer or shorter and then I cannot reference a particular part of the file by a time (minute:second).
     Any ideas of programs that could do this?  Or does Audacity do this?

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