WWJ 950 AM - America's second oldest mass-audience broadcaster
WDET 101.9 FM - Detroit public radio - http://www.wdetfm.org/
WHFR 89.3 FM - Henry Ford Community College Radio - http://www.whfr.fm/
WHPR 88.1 FM and TV Channel 33 - another low-power local broadcaster - http://whprtv33.com/
Since Detroit is on the border with Canada, you can also pick up some good stations from there.
CJAM 91.5 FM - The University of Windsor - http://www.cjam.ca/
CBC Radio One 1550 AM - http://www.cbc.ca/programguide/schedule/dailySchedule.jsp?network=CBC%20Radio%20One
- Especially the acclaimed Ideas program. - http://www.cbc.ca/programguide/program/index.jsp?program=Ideas&location=Windsor,%20Ontario
CBEF 540 AM - Radio Canada -- On en parle.