I run iTunes from a server tucked away at the back of a closet, streaming to Airtunes speakers, and I use iPhone's Remote software to control everything. I love it, except: There's no obvious way to control iTunes radio streams from Remote. So when I want to listen to the radio (say, every single morning to hear NPR news), I have to climb into the closet and launch it from iTunes there.
My solution: Create a playlist in iTunes for the radio stream(s) I listen to regularly. Then they show up as playlists in Remote on the iPhone.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20090814113933554