Podcasting legal guide by Creative Commons
For those still skeptical that podcasting is indeed an emerging tool, check out this legal guide to podcasting released by Creative Commons.
While I'm not a lawyer, and the authors of this guide do recommend you seek legal advice, it provides general information on what you should be thinking about when including copyrighted information and trademarks in your podcast.
Generally, podcasting is no different from any other media. According to this guide, if you want to include it, get permission. Simple. Nothing's fair game and just because the podcasting medium is new is no excuse to circumvent copyright laws. In this case, ignorance is not bliss, so if you're a podcast producer, review this guide.