Driver circuit for high-power LEDs

[Spacemeat]

I'm envisioning a tiny shield which contains an array of buck/boost converters for driving high-power LEDs (1-5 watt, 2.8/3.8 Vf).  Something that can maybe even be jumpered or regulated to accept different voltages in (3.3, 5, 6, 9, 12), can handle 350mA per line, and control fading with PWM.

[tomcUT]

this definitely gets my vote.