I gave my dear an Ipod thingamajig for christmas & we've spent many hours searching for good podcasts

Do you have any suggestions for good podcasts??? We have the ones from NASA, CBC, BBC etc etc but thought someone might have other ones they can suggest.

Whilst i'm here..i'll throw this one out for listening pleasure. It's by a local-ish dude known for his quality photos @ WA mtb events
http://www.themountainbikeshow.com/