Final answer:
RSS (Really Simple Syndication) is the key technology used in podcasting, allowing for automatic distribution and syndication of podcasts to subscribers.
Step-by-step explanation:
Among the technologies typically used in podcasts, RSS (Really Simple Syndication) stands out as the primary technology. RSS feeds are used to distribute and syndicate content automatically. Listeners can subscribe to a podcast's RSS feed, which will automatically download new episodes to their devices as they are released. While vlogs are video blogs that share similarities with podcasts in terms of content creation, they are not typically associated with the technology used for podcasting. MSN Messenger, a discontinued instant messaging service, was never designed to support podcasting. The primary technologies supporting podcasts are those related to audio recording, editing, hosting, and syndication, with RSS being the most crucial for distribution.