The Magical Jelly Bean SHN Shortener is a freeware utility for easily converting those enormous SHN & FLAC files to smaller MP3 or OGG Vorbis files. With the SHN Shortener you can customize your settings (default is 192bps, stereo), add ID3 tags, rename your files on the fly (using the ID3 tags), and even delete those old files all in 4 easy steps.

Be wary, MP3 and OGG are not replacements for lossless audio like SHN and FLAC, but simply a reasonable alternative to those of us who don't hear a difference and can't see a reason to keep those enormous files.