Commercial podcasts can provide teaching resources. Here are a few faculty recommended podcasts from different disciplines:
60 Second Science Fast, current science facts in one minute. This is a great way to remain current.
Freakonomics About 30 minutes each, these podcasts include economic and social concerns.
Grammar Girl About 10 minutes each, these podcasts address common grammar and usage questions and provide clear answers.
Khan Academy Videos on various mathematics topics, in just about five minutes.