The Navaid Aziz one was really good. I was supposed to go to the Suhaib Hasan talk but I never went nor listened to it, so I don't know how it is. The Navaid Aziz one is on Google Video by the way, but you can easily convert it to MP3 if you want.
EDIT: Someone just reminded me (JazaakAllaah Khayr to them)
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