Audio-rich Tools
Audio Creators (recorders)
Voki - talking avatars - http://www.voki.com/
Vocaroo - simple audio recorder - http://vocaroo.com/
Audio Creators (mixers)
Nature Sounds - http://naturesoundsfor.me/
Sounds to Embed - http://inudge.net/
Audio Editors
Audacity - download free software - http://audacity.sourceforge.net/
Myna - online free tool - http://aviary.com/apps/flash/aviary/index.aspx?tid=6&Myna#
A little more advanced - an embed tool for reading on your webpage - http://vozme.com/webmasters.php?lang=en
Music Sources
Jamendo - free music - http://www.jamendo.com/en/