Twitter is a Web 2.0 utility that asks the question "What are you up to?" It's a microblogging platform that allows users to share small tidbits about their current activities, locations, plans, and more. I can send out a Twitter update using my cell phone or my blog or by logging into the Twitter Web site.

Podcasting is one of the most explosive technologies to hit the Internet. And with literally thousands of podcasts available on Apple iTunes, the need for high-quality production is critical. In this free, on-demand, three-part seminar Apple experts take you behind the scenes to see what it takes to perform a great-sounding podcast, produce a professional show, and promote a podcast to reach as many people as possible.