Quick Links to the most popular live online Internet Radio Stations:

The Most Popular Online Internet Radio Stations

Please read, scan what follows for Categories of Online Radio Stations

The most popular live, online News Radio Stations

ABC News Video cycles through stories well
Al Jazeera in English with Video
BBC World Service Radio
CBS News
CNN Radio
Fox-News
MSNBC
NPR National Public Radio
WINS 1010 News in New York City WINS 1010 Live

The most popular online Business Radio Stations

Bloomberg.com/radio covers the Market and the Economy.
BusinessTalkRadio.net
KenRadio.com World Technology Roundup each business day about Media, Technology and Entertainment Industries
VoiceAmerica.com

The most popular Talk Radio programs

NewsMax lists the Top 25 Talk Radio hosts.

1. RushLimbaugh.com has 20+ million listeners. His TV Show
2. Bill O'Reilly with his Radio Factor as America's second most influential in America.
3. Don Imus as America's third most influential
4. Michael Savage as America's fourth most influential
5. Sean Hannity as America's fifth
6. Laura Ingraham as Sixth
For 7. through 25 see NewsMax, or see About's list of the most popular syndicated radio programs.

The Most Popular Pop Music Radio Stations in the USA see the Wikipedia most popular stations list

For popular Radio Stations by country see LogFM.com.

from About.com:

Top 10 Top 40 / Pop Radio Stations

1. KIIS - Los Angeles Pop, Top 40
2. Z100 - New York
3. BBC Radio 1 hear what is popular in the UK
4. Star 94 - Atlanta hear what is popular in the South
6. Yahoo! LaunchCast Pop
See top40.about.com for more or see About's list of popular syndicated radio shows.

from Radio.Aol.com:

The Top 10 most popular live online radio stations at Radio.AOL.com

1. Top Jams Top hip-hop & R&B jams

2. Fresh 40 The 40 biggest hits in music right now

3. Top Pop The hottest pop hits from the biggest stars

4. Top Hip-Hop Hip Hop's latest and greatest

see 5. through 10. at Radio.AOL.com Shoutcast is another popular source of user created radio stations, owned by AOL.

Radio-Locator is useful, trying to include All World Radio Stations. See their U.S. Radio Stations Sorted by State.

Pandora.com and Last.fm, at both you can create your own internet radio station or listen live to their most popular radio stations.

Yahoo Music provides a lot. I use their Launchcast radio from chat using Yahoo Messenger. Yahoo Music Radio Stations include access to the most popular on land radio stations by Location and Genre and Yahoo's own exclusives like Love Songs, Country, R&B or Hip-Hop. I use Yahoo to listen to WBZ News Radio and WINS in NYC.

Radio.com is another easy to use system to access over the air radio stations with web streams. Take a look at Radio.com's list of News Radio Stations. When at Radio.com you can access all of the Yahoo Radio Stations. Like Yahoo's 2010-Best of station with the biggest hits of 2010.