May i suggest a open source audio extractor. I have been looking for an extractor for a while now and i keep hearing post bout Audio editing programs. i see we have 2 already but i haven't seen one that could extract audio form video. Maybe some one could look in to this. AoA Audio Extractor. it is free and open source and also under the GPL license. it is also 3Mb small enough to fit on a usb flashdrive.
http://www.aoamedia.com/audioextractor.htm
sorry bout not posting the link 
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Wow, I just noticed I still had a signature, that's enough of that.
You could always use MediaCoder to do that. It's already portable if you download the 7-Zip format.
http://mediacoder.sourceforge.net/
that AOA is Open Source???
AFAIK its only freeware...
EDIT
The license sais:
AoA Audio Extractor is provided as FREEWARE for non-commercial, personal use at home ONLY.
AoA Audio Extractor may be freely distributed, with exceptions noted below, provided the distribution package is not modified.
AoA Audio Extractor MAY NOT BE DISTRIBUTED FOR COMMERCIAL PURPOSES.
AoA Audio Extractor MAY NOT BE PACKAGED OR BUNDLED WITH COMMERCIAL PRODUCTS.
AoA Audio Extractor MAY NOT BE SOLD INDIVIDUALLY OR BUNDLED WITH OTHER PRODCUTS (INCLUDING EBAY).
PROGRAM IS DISTRIBUTED "AS IS". NO WARRANTY OF ANY KIND IS EXPRESSED OR IMPLIED. YOU USE AT YOUR OWN RISK. THE AUTHOR
WILL NOT BE LIABLE FOR DATA LOSS, DAMAGES, LOSS OF PROFITS OR ANY OTHER KIND OF LOSS WHILE USING OR MISUSING THIS SOFTWARE.
The FFMPEG Lib used by AoA Audio Extractor are licensed under the GPL and are maintained by MobileHackerz.
A copy of the source code for these binaries can be found here: http://www.nurs.or.jp/~calcium/3gpp/sources/
So its definitely NOT Open Source.
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