Here are two lectures given by James White discussing the basic beliefs of Islam and correcting common false views of Islam:

Here are some additional lectures and sermons on Islam from James White on Sermonaudio:

http://www.sermonaudio.com/search.asp?speakerWithinSource=&subsetCat=&subsetItem=&mediatype=&includekeywords=&exactverse=&keyword=Dr.%5EJames%5EWhite&keyworddesc=Dr.+James+White&currsection=sermonsspeaker&AudioOnly=false&SpeakerOnly=true&keywordwithin=islam&x=-605&y=-440

For  more information on Islam and how to better evangelize muslims check out James White’s book, What Every Christian needs to know about the Quran:

http://store.aomin.org/christian-apologetics/islam/books/what-every-christian-needs-to-know-about-the-quran-book.html