I’ve seen a fair few different speaker systems for your iPod but this is the first one that’s also a glasses case, the Eye Play.

Eye Play is fashionable, lightweight and the ultimate iPod accessory. Eye Play speakers are compatible with iPod, iPhone, Zune and MP3 players. Eye Play is a water resistant sunglass case with built in NXT flat panel speakers! Our lightweight Eye Play accessory case is a portable speaker case for your iPod, iPhone, Zune and MP3 players and has a wrist strap, so you can easily carry it anywhere with you.

I couldn’t find a price but you can get further details and order from the Eye Play site.