Convert .WMA Audio to MP3, WAV, etc. for iTunes on Mac OS X (for free) with Switch
If you would like to convert .wma (Windows Media audio) files to MP3 on your Mac, you should check out All2MP3, a free program for OS X that was reviewed well by the Download.com team.
If you would like to convert those .wma files to something else, like AIFF (.aif), .au, Ogg Vorbis (.ogg), or Free Lossless Audio Codec (.flac), you should consider Switch. Switch is free to try for a limited time; get it here.
I have tested both All2MP3 and Switch and am happy to report they both work just fine.