ON/OFF strobing multiple high-power LEDs (500mA+)
If you can live with just on/off and PWM, I offer a board with 32 N-channel MOSFETs that you control by shift register, with the shift register output PWM controllable.  http://www.crossroadsfencing.com/BobuinoRev17/  The transistors have very low Rds, and are rated for high currents.