MP3 Decoder 1.9 has made some serious improvements over previous versions and is one of the better free mp3 decoder programs out there. This build features a new decoding engine, numerous bug fixes, and new features.
The program does a great job handling large batch conversions. Simply load up any number of files and hit the decode button. I was able to load 87 files in the queue without a problem. The program works fairly quickly as well, transforming your MP3s to WAV without a hitch. Quality was also good with the decoded files.
MP3 Decoder 1.9 is a fully functional trial with no nag screens or crippled features. You can register the program if you like it for $10. Compare with the popular MP3 to WAVE Converter.