For those that don't know (as I didn't when I woke up this morning!) the method of including internet radio stations on the MVP is easy. Create a text file containing a URL on a single line, of the stream you wish to play. Then save it with a .mvp extension, and place it somewhere on your harddrive. Then, use the standard search folders tool to build the catalog of these ready for the MVP.
I assume shoutcast.com is still the "one" to use; it certainly has enough material to keep you entertained for a year or three!