I find podcasts are a great way to learn. I always have some handy (there are players for most mobile devices) and they can fit in a brief time gap (some are just 3 minutes long), but I also enjoy the 60+ minute deep dives and interviews. Below is a list of some Agile-related ones, with my favourites highlighted; please let me know if I missed any!

• Adventures with Agile
• Agile Amped
• Agile and Beyond
• Agile Answers – Adam Weisbart
• Agile Chicago Style Podcast
• The Agile Coach
• Agile Coaching Network
• Agile Coffee
• Agile Development: The Enterprise Challenge
• Agile Doctor
• The Agile Executive
• Agile.FM
• Agile For Humans
• Agile Games
• Agile in 3 Minutes
• Agile Instructor
• Agile Next
• Agile NYC became Agile.FM (see above)
• Agile Path
• Agile Pubcast
• The Agile Revolution
• Agile Toolkit Podcast
• Agile University
• Agile Uprising
• Agile Weekly
• Agile with Coach and Beer
• Badass Agile
• Boss-level Podcast
• Deliver It
• DevCoaches
• Developer On Fire
• Growing Agile
• Happy Agilist
• Illustrated Agile
• InfoQ interviews
• Just Add Wendy
• Leaders in the Trenches
• Leading Agile
• Lean-Agile Straight Talk
• Lean Blog
• Lean Change Management
• Lean Startup
• Meta-Cast
• OnSoftware
• Scrum For Success
• Scrum Master Toolbox Podcast
• Software Process and Measurement (SPaM) Cast
• Software Rocks
• The Daily Scrum
• This Agile Life
• Why Agile Transformations Fail
• Zero to Agile Podcast Series

(Struck through if feed is dormant but past episodes may still be of interest)

There’s also the Agile Podcast Network, since August 2016.