A repository of test audio files in a wide variety of formats (PCM, IEEE, MP3, AIFF, OGG, WMA, mu-law, a-law, ADPCM etc), at different sample rates, bitrates, bit depths and channel counts.

Basic audio is a class library with a test project (audio player/recorder) to faciliate basic audio playing and recording. There are other frameworks available to give you very detailed and complex audio functionality, this one aims to provide only the basic playback / record methods. That being the case, the goal is to keep it simple for those that just want to incorporate playback/recording with minimal code or learning other frameworks.

.NET Audio library

Easy sound is a .net tool for managing audio stream in the memory. It joins existing wav streams into single one using different method.

ID3 Hunter is an application that uses the Last.FM and Gracenote databases to automatically detect ID3 tags for audio files. It also supports manual tag entry.

A .NET library for writing audio related applications, with the ability to record, play and manipulate sample data.

SEHE is an example of how to use the Skype API. The full C# project, including source code, and heavily commented is available for download.

Viva Music Player is a free and open source music player. It's using C# and NAudio audio library to play audio files.