This new portable speaker dock and charger from XtremeMac is designed specifically for the iPod Nano and, true to the Nano's micro form factor, this setup is tiny.

The XtremeMac MicroBlast consists of 4 really small drivers built into a 1" thick plastic case with a clear plastic flip cover that also acts as a desktop stand. 

Powered by 4 AA batteries or the included AC adapter the MicroBlast turns your iPod into a mini boom-box.