SHN
A Small SHN and MD5 FAQ, File Extension Details for .SHN, SoftSound - Shorten, Wikipedia about SHN
TTA
CoreTTA, File Extension Details for .TTA, SourceForge - TTA, TTA - The Source, TTA free lossless audio codec, Wikipedia - TTA
WAV
File Extension Details for .WAV, Original RIFF file format description, WAVE file format, Wikipedia.org: WAV
ATRAC: Adaptive Transform Acoustic Coding for Mini
ATRAC is an audio format based on psychoacoustic principles originally used for Sony MiniDisc players.
GSM 06.10 Lossy Speech Compression Format
Details about the format and example source code.
Lossless compression vs. speed
Comparisons of most popular lossless audio formats.
Rob Nowiks Audio Resource
Site contains discussion of audio formats, related audio algorithms and general audio production techniques.