Icefish are not the only "cool" animal out there. It turns out there are actually quite a few species that are resistant to freezing. Here is a brief list of some of my favorites:
Snow Fleas: 
These fleas produce a glycine-rich antifreeze protein which differs from other insects suggesting that this was an independent adaptation to freezing (Source: Graham LA, Davies PL. (2005) Glycine-rich antifreeze proteins from snow fleas. Science. 310:461). Scientists have created a synthetic version of this protein that you can read about here.
Wood Frogs:
Professor Ken Storey at Carleton University in Ottawa knows about freezing temperatures. To protect their limbs from drying out, wood frogs draw them closer to their body and tuck in their toes. Glucose is their chosen antifreeze, which they build up prior to freezing. Here is a pretty neat website where you can read more about these amazing frogs.
Photo Source: http://discovermagazine.com/2005/feb/biology-of-cryogenics
Painted Turtle Hatchlings:
Painted turtles are residents of freshwater North American coastal regions. The young hatch in the late summer and survive winter by hibernating inside their nest at a depth of ~10cm beneath ground while the adults spend the winter underwater. To read more about these cute turtles visit the Laboratory for Ecophysiological Cryobiology at Miami University.
Humans?
These animals offer hope for better methods of preserving human organs for transplantation. Antifreeze proteins also provide hope for some people willing to spend the money on freezing their head or whole body shortly after death in the hopes of being awakened in a future capable of curing their illness and restoring life.
Honey Bees:
Honey bees use a different strategy to survive cold, they huddle to produce heat. Temperatures in the cluster of bees can be as high as 34 degrees C even when the outside temperature is lowered to a brutally cold -80 degrees C, which I find to be pretty remarkable. (Source: Southwicka EE. Cooperative metabolism in honey bees: An alternative to antifreeze and hibernation. J of Thermal Biology. 12:155-158, 1987)
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Even more remarkably, Japanese honeybees (Apis cerana japonica) use their communal heat generation as a defensive weapon against the Japanese giant hornet (Vespa mandarinia japonica), which is far too large and powerful (up to 4 cm in length) for the bees to overcome in any other way. But as soon as a hornet scout enters the beehive, it is surrounded by several hundred bees in a tight ball in which the temperature quickly rises to 47° Celsius, killing the hornet and nipping the hive invasion in the bud.