The publishers of Sky & Telescope, through their SkyTonight web site, provide a free monthly sky tour podcast to help you to find the celestial delights of the current evening sky.
The podcasts, hosted by Kelly Beatty, editor of Night Sky magazine, typically play for about 5 minutes.
You may download the MP3 file to your iPod or other handheld device at http://skytonight.com/observing/podcasts. Typical downloads are about 5.2 MB.