Cool Mp3 Converter 

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Cool Mp3 Converter  is a powerful all-in-one tool for converting files in batches from WAV files into MP3 or Microsoft Media Audio (WMA) format and back. It converts MP3 or WMA files into WAV format for burning onto CD and  converts WAV files into MP3 or WMA  format for listening to your favorite music in smaller size and compatible with most MP3 player. 
The tool also has a built-in audio player that can playback either single file or all the files in a list in batches. It also makes a distinction between playing the source file and the converted version so that you could appreciate the difference in quality before you convert the whole collection. There's also an ID3 tag editor and some more minor but useful features.

Major Features:

  Easy to use – Just one right click of the mouse on the window explorer!! 
  Fast encode and decode MP3 or WMA files with high quality
  Converts .MP3,.MP2,.MP1,.WMA into CD quality format WAV files ready to burn.
  WAV to MP3, WAV to WMA, MP3 to WAV, WMA to WAV 
  Converts music play lists (.M3U, .PLS) to WAV
  Convert audio files in batches
  Play audio files in batches
  Display & Edit MPEG file ID3 tags 
  File Drag-Drop supported
  Registered users get free upgrades for life!