Audio Expert

http://www.audioexpert.com/

AudioExpert is a free and simple online audio editor, file converter and sound recorder. All the standard functionality of an audio editor provides you with an easy way to create a ringtone for your cell phone. You will find AudioExpert useful also as a powerful audio file converter which will allow you to modify the file format of your files, their bit rate, frequency, etc. If your computer is equipped with a camera and microphone, you can use AudioExpert to record your sounds.
I've not used this yet so don't know how good it is.