Yes — manufacturers — make more devices like this one. The Monolith MP3 player is fused into a solid 1.5mm aluminium casing — not stuck together with glue or screws. It’s a unique manufacturing process pioneered by the manufacturer, Estar Laboratories. Testers have run the player over with a car, shot the player with a BB gun, thrown the player against a brick wall — all without breaking the unit. It has 512 MB memory and an internal lithium-ion rechargeable battery (featuring over 19 hours of playback time).

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The Boomtune Mini is a portable speaker system that incorporates a tripod design and has a 2 x 1W output. It runs on one AAA battery.

Boomtune Mini can be used with almost any MP3 player. It appears to only be available in Japan. More information at Yanko Design - thanks for the tip.

This CD player for your car also features a USB port and a SD Memory Slot for MP3 playback. Made by H&B, it seems to be only available in the UK for about £78. A CD player by Pyle, available in the US, seems to do similar things, since it has a “Universal USB 2.0 Card Reader”.

Via Red Ferret

This MP3 playing boombox stores 256MB of music. It connects to a computer via USB, and includes a headphone socket, alarm clock feature (wake up to music), FM radio, and travel pouch.

Update: We’ve heard this MP3 player has poor sound quality.

Available from: JR.Com
($149.99)

This waterproof casing goes on top of a iRiver. There is also another waterproof MP3 player by Finis that uses bone conduction to produce sound underwater.

Available from: H2O Audio

The Boostaroo is a pocket-size portable audio amplifier that will give anything that uses a headphone an increase in volume by 100%.

It also functions as a splitter and allows you to share your music with two other people (3 mini-headphone jacks total).

It increases the battery life of your audio player, because the player does not have to function as the amplifier. It does not distort the frequency response of the audio (the specs are: 20 to 20,000Hz +/- 2 dB). It runs on two AA batteries.

Home Page: Boostaroo, also a review page.

Available from: Thinkgeek ($24.95)

Sony has released what it claims is the smallest pendant-style mp3 player: Sony AD-EMPZ. It weights less than half an ounce and has 256MB memory (8 hours of playback). It runs on a rechargeable battery and costs $184.

The Aiwa Flush also has 256MB and can play for up to 11 hours, using AAA batteries. It costs $349.

We also noticed this 256MB player available from Gadgeet for only $109.95, making it the most inexpensive we’ve seen. It plays for 8 hours and weighs just over an ounce:

Thanks to Popgadget for the lead.