How do I....

[tralalala]

Extract audio from a youtube video, so i can save it on my PC as an audio file? :unsure:

Google is my friend.. Never mind. :)

[pifpaf]

hmm.. first save it to your PC(video downloader (http://www.videodownloader.fdrlab.com/), or install this Firefox addon (https://addons.mozilla.org/en-US/firefox/addon/3006) if you use firefox browser) and then use a FLV audio extractor program, like this one http://www.shareup.com/Flv_Audio_Extractor-download-49396.html

[maverick_andy]

save it as FLV file then use total video converter to convert it to Audio file.

[vampiro]

or rename the extension to .avi also works