Here are some fun and informational astronomy podcast links:

365 Days of Astronomy - A bit stuffy, but full of real science.
Astronomy a Go-Go - Podcast PLUS lots of interesting viewing info
Astronomy Cast - This one is really good!
Introduction to General Astronomy - A college astronomy class
Silicon Valley Astronomy Lectures - Non-technical talks by noted astronomers
Skywatch with HubbelWatch - Lots of good stuff at this site
Slacker Astronomy - A bit off the wall, but fun!

Here are some fun and informational astronomy Videocasts:

HubbleCast - News and Images from the NASA/ESA Hubble Space Telescope.