This is a fine introduction to Aristotle's Nicomachean Ethics in several short but detailed lectures, each reviewing one chapter of the Ethics, with a solid introduction at the beginning. This is an excellent standard of dry American scholarship offered by The Teaching Company - always supplying good quality learning materials. Check out their website for more details.
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'Giants of Philosophy - Aristotle' -narrated by Charlton Heston (!)
A Knowledge Products release, their slogan being "Our country's most well-known personalities narrate the history of our civilization" This is actually a really nicely prepared audiobook with some fine details of Aristotle's life, comprehensively compiled without sensation nor ambiguity. Not the greatest fan of Heston, I was a little apprehensive but I have to admit it's great listening, he has (had) a fine speaking voice.
Download audio 'Giants of Philosophy - Aristotle'
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Paul Strathern's concise introduction to Aristotle
Download audio 'Paul Strathern - Aristotle in 90 minutes'
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The Modern Scholar: Ethics (Aristotle chapter (6) only)
Professor Peter Kreeft gives a fine basic overview of The Nicomachean Ethics in this 35 minute lecture. Not detailed but really worth a listen.
Download 'The Modern Scholar: Ethics'