DataMPX is a tool that lets you catalog your MP3 music collection, regardless of it's being on your hard drive or on removable media, say, ZIP disks or CD-Rs. The tool has a gorgeous interface and is pretty easy to use and understand.
MP3-2-wav Converter is a free mp3 decoder that allows you to convert MP3 files into WAV files in order to burn them on a CD. The program can normalize the resulting files, avoiding common ups and downs in the volume.
