Just a few listed here. Hey, I'm a stereotypical computer-geeky type, so I hope you can understand the reason why this list is so small!
Internet Sports Radio Stations
http://espnradio.espn.go.com/espnradio/index
ESPN brings us 24x7 sports coverage via ESPNEWS.
http://www.sportstalk980.com/listenlive.php
Using and promoting HD Radio (high-quality AM broadcasts), listen to many many sports radio shows. (Free) registration is required.
http://www.theticket.com
From Texas: "All sports, all the time."
http://www.bobandtom.com
(Okay, the Bob and Tom show is only kinda sports related, as they have a small sports recap every day. And while they have lots of free things to listen to, the show itself is subscription-only. But it's got to be included on this list, because (if you're not easily offended) these people are funny.