My suggestion would be to spread out that menu near the top that includes all the playlist files, especially for a newcomer to internet radio I think it could be a bit confusing what you're supposed to click on to actually hear it...yeah I know there's another one up by the "now playing" text but still.
Yeah, I'm not crazy about the main menu layout ... too busy I think. What I might do is make a content-box on the main page for the "tune in" links ... I did play with a dhtml drop-down menu thingy ... didn't like that at all.
I like having direct, one-click access to as much as possible from the menu ... but, maybe we'd be better served by pulling out some of the menu options.