For more on the Curve's iffy GUI, here's our own John Herrman:
Instead of building out from the user interfaces found in their larger PMPs, Cowon seems to have gone for something fresh. And by "fresh", I mean "variously lifted from popular PMP interfaces, including that one that you don't want to lift from, because everyone will call you on it immediately."
Like I said, form over function, for $US240. [Amazon — Thanks, Erich!]