I've been meaning to post this sooner, but I bought an Archos 5 a while back and it rocks.. anways.
It's got a web radio feature that has many LiveATC.net feeds, one being the KJFK tower. I'll have to look into them more and update this topic.
I would think their Archos 5 IT, Archos 7 and new Archos 9 would all have the same web radio or newer features.