The dusk is one of 1scale1 newest creations by David Sjunnesson with assistance from Tony Olsson and its the progression of the dawn breakout board for the TLC5940 chip by David Sjunnesson. The dawn has the possibility to pwm (pulse width modulation) 16 different ports over serial communication from example an arduino microcontroller or similar. (This means in ordinary language that you can for example dim 16 LEDs up and down individually) The max rating of the chip is 17V and 120mA / port. This is adjustable by an resistor down to about 10 mA.
http://www.instructables.com/id/The_Dawm/ for more info about the board.
The dusk uses four TLC5940 which gives it the possibility to control 64 direct PWM outputs with added power ditch and power connector.
Both boards will soon be available soon at http://blushingboy.org/