That's tricky, there's a lot of software that would do it, but you'd have to buy/steal it, download and install it. I found one called FLV extract on this page. http://www.moitah.net/ It's free, but I don't know if it's any good.
What are you doing with it? Do you want an Mp3 specifically so you could play it somewhere other than your pc? FLV files are absolutely miniscule so if you just want to listen to it, you could download the whole thing (video/audio) from a site called http://keepvid.com that creates a download link for any youtube, google video and the like.

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