Online Audio Extractor:
Online Audio Extractor is a handy software for audio extracting. It can help you to extract sound streams from your favorite videos and save them as OGG, MP3, Wave or FLAC files.
The interface is very simple. To extract audio tracks from video files, just open video from your computer, select proper output format, and click the "Extract audio" button.
The application supports all major video formats (AVI, FLV, MP4, MPG, MOV, RM, 3GP, WMV, VOB and other).