Here's my list:
Engadget
I Should Be Writing
In Business
IT Conversations
NASACast
NBC - Meet the Press
NewsHour with Jim Lehrer
NOW
NPR Technology
On the Media
Quirks and Quarks
Rockets Away!
The Space Show
Science Friday
Skepticality
Slacker Astronomy
Official LOST Podcast. :-)
This Week in Science
Skeptic Tank

and, of course... Universe Today :-)

You should just be able to search for them all in iTunes

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Fraser Cain
Publisher
Universe Today - Free space news delivered by email every weekday.