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Probably the easiest thing to interface to, ever. This took about 30 minutes.
A processing interface with two modes: turn on current LED, or drag up/down to fade LEDs in and out.
Discussion and library: arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1218174457/0
Datasheet: focus.ti.com/lit/ds/symlink/tlc5940.pdf