What audio podcasts would you recommend on usabilty, information architecture, iteraction design?
I listen to these:
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I'd also recommend the dConstruct conference podcasts (the last few years are all available) - they also include some interesting talks on social media, as well as usability and UX topics:
I would recommend the Pixel8 Podcast.
Pixel8 is an audio and video podcast series bringing UX and technology experts together to discuss user experience in the .NET space.