This is four sure0832 green LED matrices (8×32 pixels) concatenated, driven by a Teensy 2.0 http://www.pjrc.com/teensy board.

The Arduino source code is here: make sure to select Teensy 2.0 as your board before programming!

/*
  Sure0832 sample application
  Copyright 2010 Benjamin Sonntag <benjamin@sonntag.fr>  http://benjamin.sonntag.fr/

  History:
        2010-03-20 - V1.0 Initial version, a little time after 26C3 :D

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330,
  Boston, MA 02111-1307, USA.
*/

#include <Arduino.h>
#include <inttypes.h>

#include "Sure0832.h"   
#define X_MAX 31
#define Y_MAX 7
#define X_SIZE 32
#define Y_SIZE 8


sure0832 d1;
sure0832 d2;
sure0832 d3;
sure0832 d4;

void setup ()  // flow chart from page 17 of datasheet
{
  d1.cs=4;
  d1.data=7;
  d1.wrclk=6;

  d2.cs=2;
  d2.data=7;
  d2.wrclk=6;
  
  d3.cs=1;
  d3.data=7;
  d3.wrclk=6;

  d4.cs=3;
  d4.data=7;
  d4.wrclk=6;
  
  
  sure0832_displayInit(&d1);
  sure0832_displayInit(&d2);
  sure0832_displayInit(&d3);
  sure0832_displayInit(&d4);
}


void octopuce();
int readstringfromserial();

#define intensity 15


void loop ()
{
  
  sure0832_sendcmd(&d1, SURE0832_CMD_PWM + intensity);
  sure0832_sendcmd(&d2, SURE0832_CMD_PWM + intensity);
  sure0832_sendcmd(&d3, SURE0832_CMD_PWM + intensity);
  sure0832_sendcmd(&d4, SURE0832_CMD_PWM + intensity);
  delay(SURE0832_DISPDELAY);

  sure0832_clearScreen(&d1);  
  sure0832_clearScreen(&d2);  
  sure0832_clearScreen(&d3);  
  sure0832_clearScreen(&d4);  
  delay(SURE0832_DISPDELAY);

//  octopuce();
  scrolltext();
}


const char sentence1[512]="                         Bienvenue au Post Tenebras Labs, le premiere Hackerspace ici a Geneve.  Que voulez-vous faire aujourd'hui?     ";
uint8_t sentencepos2=0;

int incomingByte = 0;
#define DELAY_FONT 10

void scrolltext() {

  byte i;
  int size1,curp=0,curx=32,p=0,x=0;
  int strilen;

  strilen=strlen((char*)sentence1);
  while (curp<strilen) { // && !readstringfromserial()) {
    p=curp;
    curx--;
    x=curx;

    size1=Font_Draw(&d1, sentence1[p],x,0);
    x+=size1;
    if (x<=0) {
      curx=x;
      curp++;
    }
    p++;
    // 1st Panel : 
    while (x<=X_MAX && p<strilen) {
        x+=Font_Draw(&d1, sentence1[p],x,0);
        p++;
    }
    x-=X_MAX+1; 
    p--;
    x-=Font_Draw(&d2, sentence1[p],-9,0);
    while (x<=X_MAX && p<strilen) {
        x+=Font_Draw(&d2, sentence1[p],x,0);
        p++;
    }
    x-=X_MAX+1;
    if (p==strilen) {
      delay(DELAY_FONT);
    } else {
      p--;
      x-=Font_Draw(&d3, sentence1[p],-9,0);
      while (x<=X_MAX && p<strilen) {
          x+=Font_Draw(&d3, sentence1[p],x,0);
          p++;
      }
      x-=X_MAX+1;
    }
    if (p==strilen) {
      delay(DELAY_FONT);
    } else {
      p--;
      x-=Font_Draw(&d4, sentence1[p],-9,0);
      while (x<=X_MAX && p<strilen) {
          x+=Font_Draw(&d4, sentence1[p],x,0);
          p++;
      }
      x-=X_MAX+1;
    }
    if (p==strilen) {
      delay(DELAY_FONT);
    } 
    else
      delay(DELAY_FONT); // added by Paul to slow it a bit
//    delay(SURE0832_DISPDELAY/3);
  }
  
  sure0832_clearScreen(&d1);  
  sure0832_clearScreen(&d2);  
  sure0832_clearScreen(&d3);  
  sure0832_clearScreen(&d4);  
  delay(SURE0832_DISPDELAY);
  delay(SURE0832_DISPDELAY);
}



/*
  const char octopuc1[70]="31 Mai 2010, Octopuce et UnMillieme inaugurent le led panel 7x.";

void octopuce() {
  int y,x,i;
  for(y=-6;y<=7;y++) {
    x=0;
    for(i=0;i<9;i++) {
      Font_Draw(&d1, octopuc1[i],x,y);
      Font_Draw(&d2, octopuc2[i],x,y);
      Font_Draw(&d3, octopuc3[i],x,y);
      Font_Draw(&d4, octopuc4[i],x,y);
      Font_Draw(&d5, octopuc5[i],x,y);
      Font_Draw(&d6, octopuc6[i],x,y);
      x=x+Font_Draw(&d7, octopuc7[i],x,y);
    }
    delay(3*SURE0832_DISPDELAY);
    if (y==0) delay(6*SURE0832_DISPDELAY);
  }
  

  sure0832_clearScreen(&d1);  
  sure0832_clearScreen(&d2);  
  sure0832_clearScreen(&d3);  
  sure0832_clearScreen(&d4);  
  sure0832_clearScreen(&d5);  
  sure0832_clearScreen(&d6);  
  sure0832_clearScreen(&d7);  
  delay(SURE0832_DISPDELAY);
}
*/

If you tweak the source, please leave a note on the display in the hackerspace…