iPod - streaming music service?

ok, I’m not an iPod fan, I use a Zen V Plus with Rhapsody to go. My friend would like to do something similar for her iPod, if possible, and I’m not sure if it is. Is there a monthly streaming music service for the iPod akin to Napster/Rhapsody to go?

There are podcasts but no such live streaming service for the Ipod as of yet.