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You can read about it here:
http://www.nanocoolers.com/technology_liquid.php

As a metal, the liquid is both highly thermally conductive and highly electrically conductive. The thermal conductivity makes it ideal for heat removal and dissipation. The electrical conductivity enables the use of electromagnetic pumps to propel the liquid.

One unique benefit of liquid metal is the ability to pump this coolant efficiently with a silent, non-moving parts pump. The electromagnetic pump is located in-line with one of the fluid channels. It consists of magnets, a yoke and two electrodes, again ensuring the simplicity of the solution.

Geeze, why does /. keep on linking to physorg, which has crappy articles and no links to real information about stuff.

Here's a more in depth article on X-bit [xbitlabs.com]. NanoCoolers has a pretty in depth description [nanocoolers.com] of the product. It's basically a watercooling loop but using a molten metal. The really cool part is that because the metal is obviously electrically conductive, they're using a DC current combined with some magnets to take advantage of Lorentz force [gsu.edu] to propel the fluid.

Geeze, why does /. keep on linking to physorg, which has crappy articles and no links to real information about stuff.

Here's a more in depth article on X-bit [xbitlabs.com]. NanoCoolers has a pretty in depth description [nanocoolers.com] of the product. It's basically a watercooling loop but using a molten metal. The really cool part is that because the metal is obviously electrically conductive, they're using a DC current combined with some magnets to take advantage of Lorentz force [gsu.edu] to propel the fluid.

The liquid metal cooling topic was covered on /. before, eg:
http://hardware.slashdot.org/article.pl?sid=05/05/ 03/1421243&tid=222/

The technology probably derives from http://www.nanocoolers.com/products_cooling.php/

Sapphire is just the OEM manufacturer of ATi cards. For quite a while you could only get ATi branded cards but now you can get them from ATi or Sapphire. I doubt they have much to do with the technology besides licensing it.

Geeze, why does /. keep on linking to physorg, which has crappy articles and no links to real information about stuff.

Here's a more in depth article on X-bit. NanoCoolers has a pretty in depth description of the product. It's basically a watercooling loop but using a molten metal. The really cool part is that because the metal is obviously electrically conductive, they're using a DC current combined with some magnets to take advantage of Lorentz force to propel the fluid.

It uses an electormagnetic pump.
It uses sodium.

Here:
http://www.nanocoolers.com/technology_liquid.php

See their technology page.

By being patient and browsing their marketing/sales site I found http://www.nanocoolers.com/technology_liquid.php

Not that it provides the details I was looking for (like which metal or allow they are talking about) but it does give a little bit more info (How the motor works, a slightly more details schematic of such a system).

I think I'll start asking my chemist friends if they can deduce which metal we're talking about here.