A podcast is a downloadable audio or video file that you can subscribe to and get regular updates when a new episode is released (weekly or monthly). Almost all podcasts are free and the best way to use them is via Apple's iTunes/iPod.ACAAI Podcast Library
The American College of Allergy, Asthma & Immunology (ACAAI) has started publishing free podcasts/videocasts since the 2006 Annual Meeting:
2007 Annual Meeting Podcasts
2006 Annual Meeting Podcasts
Published: 12/10/2008
Updated: 01/11/2011