m3u internet music playback

just a small hitch thats probably really easy but i can't find the right menu. when i listen to m3u audio samples they play back in itunes. the problem is when you don't want to keep them i have to physically remove tonnes of these things. it gets pretty tedious as they like to scatter themselves throughout the entire music library.
i've found the tab under itunes>preferences>advanced, and it has a button to set itunes as the default player for internet playback. the problem is theres no button to deselect it????
whats the best setup to have these temporary audio files disapper when you're done? quicktime? couldn't find that menu either.

I don't want to "Use iTunes for Internet Music playback"

Hi all,
I am searching for the same solution.
I really don't want every little audio clip opening iTunes and putting itself in the library. And I agree that it is painful trying to delete these individually later on.
So, how do we make our Macs use a different program for web audio???
Bill