I've learned useful things from all of these: The Stack Overflow Podcast, Hanselminutes with Scott Hanselman, Software Engineering Radio, and Coding Blocks.
I listen to coding blocks, but a new listener should know they often take on new topics, from reading a book or something, and can explain things wrong a bit more often than I would expect from an authoritative source. Things that sound plausibly correct. So, you have to be more careful with that one.