Com FM
Index of Italian radio stations you can listen to over the Net.
http://www.comfm.com/live/radio/?c=it

Rome Buddy.com
Provides a thorough introduction to the Italian radio scene.
http://www.romebuddy.com/homesick/formusic.html

Rome Central
A local radio station guide.
http://www.romecentral.com/media.php