1000 i/o's for io

what about driving 1000 1w leds, which kind of hardware do you suggest?
I have good experiences with electronics, even i/o systems, but 1000 is another league, anybody did something similar?

i guess arduino + several demultiplex chips… yo need 1/0 values or analog outputs ?
what is the framerate that yor are looking for ?

Maybe you could check the " Rainbowduino " that ability to expand the i/o by I2C.

Hum should be better to do it out of arduino. I have tried tcl and ethernet shield on 16 leds, working but already a little delay. I m not sure an arduino is the good solution for pwming the leds. Maybe you could try other concurents to arduino with rj45input for artnet receiving?