The second addition made itself known in the form of a small speaker on the back of the unit.  Don't be fooled by the speaker's size.  Even with the din of thousands of sweaty businessmen and booth babes crowded under one roof, the Zen Stone Plus was putting out enough music to make itself heard - and then some.

Here's some pics of the device in action.  Now I understand how Chihuahuas can be so damn loud.