JerusaleMP3.com has some audio and video tours of the city.  They seem to be about 4 minutes in length (contrary to one place that suggested 2-4 hours).  You have to register on the site first with an email address, and it doesn’t seem to work with the Firefox browser.  But there seems to be some interesting and informative tours here for those who want to know more about the Holy City.  Tour-man.com seems to be the producer of these resources, though the site is connected to the Municipality of Jerusalem.