My podcast subscriptions:

General interest, science, philosophy, design and architecture:

* Radiolab: http://radiolab.org

* 99 Percent Invisible: http://99percentinvisible.org

Embedded systems/electronics:

* Sparkgap, focused on a specific technical topic each episode, sometimes with guests. http://thesparkgap.net

* Embedded.fm, focusued on technical and non-technical topics surrounding embedded systems software development but also often links with art and education, often with guests. http://embedded.fm

* AmpHour: Dave Jones and Chris Gammel ranting about whatever they feel like fairly often with guests. http://theamphour.com