The word podcast will not be mentioned from here-on-in.
Funny recordings of FAMOUS INTERNET DUDES playing D&D4e w/ professional DM. Makes for good listening.
First episode of their second adventure:
http://www.wizards.com/default.asp?x=dnd/4pod/20090218
There's another adventure with about 5/6 episodes, but you'll need to track it down yourselves.