Designer Chris Williams has hatched a concept for an DAP called the Musipen which seriously breaks from the common, rectangular conventions of typical audio players (although, it doesn't go as far as we'd like
). The most interesting component of the glowstick-esque design is its UI, which utilizes the tubular shape for navigation through menus, allowing for each end to act as a kind of scroll-wheel. While the design is just a concept right now, it does suggest some interesting possibilities for a market which is currently over-saturated with sameness. Check the gallery for all the futuristic goodness.
Musipen DAP concept breaks from convention