I am a long time listener of the Tips from the Top Floor podcast that Chris Marquardt produces from Germany. He has a great sense of humor and has many useful tips on everything ranging from equipment to improving your photography. He has an active schedule which includes workshops in the USA.
I particularly enjoy the segments that he runs with Leo Laporte (The Tech Guy).
A friend's recommendation sent me to TWIP (This Week In Photography). I have to say that the presentation by Scott Bourne and his fellow hosts is excellent. Full of news, tips, reviews - the hour is packed with very interesting information.