Similar what I blogged on RGS before – The giant headphone but this one comes with a little bit more kick to pump your jam.
No speaker on the market packs such a powerful punch. Operatingthe same way as a quality subwoofer, a secret resonating chamber amplifies the speaker output through a patented expander tunnel. [...]

This is super handy. Don’t be selfish … share your music.
This ones not for your ear, it’s for everyone to hear! This larger-than-normal 3" long earbud is a speaker for your mp3 player. With handy keyring clip and headphone jack. WARNING: Choking Hazard – small parts. Not for children under 3 yrs.

More info: [...]

Oink! With these speakers every tune will be a lucky tune.
Simply connect your music player to the cable extending from the bottom, and sound will play from a speaker in the pig’s stomach. Perfect for the kitchen, bathroom or your desk.

More info: Oink Speakers
- Texas Hold’em iPhone Application

Kind of lame to say that these speakers are the bomb. Truth is .. they are.
Blast out your tunes with The Big Bang Speaker. We’ve seen loads of iPod and desktop speakers in our time but NONE of them have looked as cool as this. It looks like an Inspector Clouseau style bomb (you [...]

Would it work on empty Zombie skulls as well?

Vibrations can go a long way, especially for the transmission of sound through material. Now you can harness that power for a creative and useful purpose.
The Yorozu Audio kit lets you use just about anything as a speaker! Starting with the included paper milk carton “speaker”, [...]

If these are louder than the built-in speakers of the iPhone they might be in business.

Anyone can become a Disc Jockey with the new DJ Speaker from Dreams, Japan. Small enough to fit in a pocket or hang from a backpack, DJ Speaker is able to connect to any audio source such as iPods or [...]