I listen to:
The Rachel Maddow Show - "Air America's Front Page" - just a bit longer than my 30 minute commute.

The Stephanie Miller Show - Stephanie and her two "No Men" take on the right wing-nuts and callers... usually funny.

Various Leo Laporte podcasts - the Security Now ones he does with Steve Gibson, the amusingly named TWIT - This Week In Tech, and occasionally his KFI call-in radio show.