Go to your favorite radio station's webpage. See if they offer a live streaming webcast. If they do, there is usually a link that says "Listen Live."
If it is a nationally syndicated radio program, check the program's website or the website of the network that has the radio program.
If they offer previously recorded programs in the form of podcasts, MP3, WMA, or RMA files, just download the file and listen to it on your computer.
Some stations require you to pay to subscribe to their service or download podcasts. Also note that some stations don't offer any online content.
I know this is probably obvious, but I tried to listen to a specific radio station on my laptop today and just couldn't figure out how. I have Windows XP Media Center on an Acer Aspire 5100.
I have Media Center and RealPlayer.
And if anyone has a suggestion for the best way to listen to the radio (I usually listen to NPR, and some music) and to download previous programs - I don't have an IPod and yes I am a dinosaur, I would appreciate it.
Thank you in advance.