Wow those are really nice looking! Good Job Chris!
I think my favorite one would have to be the iPhone Flip concept...
Its not really the iPod style, but I like the uniqueness of it from other flip phones, look at the center.
This one is pretty good too (girlie but still nice)
You can see that the circle that allows you to scroll and adjust the volume isn't there (or atleast isn't visible) but it's buttons are.
This one isn't the prettiest thing but I love the concept: