Thanks do much for the reply Hugh.
Check out Feedvalidators review of the feed... oddly enough, it says "Server return HTTP 404 Error" (same as feedburner) -- then proceeds to invalidate the feed:
http://validator.w3.org/feed/check.cgi?url=junkbox.realpunkradio.com%2F%3Ffeed%3Ditunes
I've tried ReSyncing the feed on feedburner and that didn't work.
And the reason I can't get itunes to take the feed from SSR is that, according to itunes, in order to get the feed url to change, you need to add the <itunes:new-feed-url> tag to my current feed... and I can't do that because feedburner doesn't work.. I actually tried writing a feed manually and adding that tag, then using feedburner to burn that feed and that isn't working yet...
D