Well, not exactly what you're looking for, but I'm using KungTunes for the same thing and made this block to display the current song on my site:
Pretty simple: KungTunes uploads a "trackinfo.txt" file containing the song information. This function reads it and displays it in a block (unless the file contains just "--off--", then the function doesn't return anything and the block vanishes).
Hope that helps.
bye, Dirk