One of the best ways that I've discovered to keep up to date with the constant change of technology is to listen to podcasts.  I find this a great way to learn during my daily commute and exercise regiment (refilling my coffee AND getting the mail). 

One thing I would encourage is to attempt to listen while coding.  If you can listen to music while you code you can probably listen to podcasts with little effort.  Everyone is different but here is what I've discovered about myself.

• If both ears are listening to a podcast I get too distracted and cannot concentrate enough on coding.
• If I listen using my right ear, I grok almost nothing of the podcast content.
• If I listen with my left ear, it seems to be a good balance between listening and doing.

I've heard of some who code while listening to a podcast in double speed to save time.  I can't do that but, apparently, some can. 

Here are the podcasts I find invaluable as a developer

	Polymorphic Podcast	Craig Shoemaker brings insight into software development in the .NET platform along with interviews with industry luminaries. Good content, good quality but an inconsistent schedule.
	ARCast with Ron Jacobs	Ron Jacobs is a Microsoft employee and delivers a weekly podcast on Channel 9 that dives into some tough .NET architecture topics.
	Software Engineering Radio	Not specifically .NET related but contains a wide spectrum of Software topics from Dynamic Languages to Transactional Memory to Fault Tolerance.
	Software Quality Engineering Conferences Podcast	Interviews with speakers from the Agile Development Practices 2007 Conference
	OnSoftware	Weekly interviews with some of the software industry's leading developers about a wide range of programming and development issues
	WebDevRadio Podcast	Web Development Discussion
	Agile Toolkit Podcast	Topics covering all things Agile.
	.NET Rocks!	.NET Rocks! is a weekly talk show for anyone interested in programming on the Microsoft .NET platform. The shows range from introductory information to hardcore geekiness
	Hanselminutes	Scott Hanselman discusses utilities and tools, gives practical how-to advice, and discusses ASP.NET or Windows issues and workarounds.
	ASP.NET PodCast	The ASP.NET Podcast brings a technology focus to the area of podcasts.  This podcast is geared towards developers with applications that scale to a large amount of data and users.

I would like to hear what others are listening to and what software you use to manage your podcasts.  I have a love/hate relationship with ITunes.

UPDATE:

Top Developer Podcasts Part II