Check out my JTablet, it's a native Java library that's a lot easier to install and even works on applets (if the user installs JTablet).

http://www.cellosoft.com/sketchstudio/

It's a little higher level than typical processing, but gives you much more control and power.

Marcello

Sure.

Download and install JTablet.

Now load up processing and try this code:
Code:

import cello.tablet.*;

JTablet jtablet = null;

void setup() {
  size(200,200);
  try {
    jtablet = new JTablet();
  } catch (JTabletException jte) {
    println("Could not load JTablet! (" + jte.toString() + ").");
  }
  smooth();
}

void draw() {
  try {
    // Get latest tablet information
    jtablet.poll();
  } catch (JTabletException jte) {
    println("JTablet Error: " + jte.toString());
  }
  
  ellipseMode(CENTER); 
  
  if (mousePressed && jtablet.hasCursor()) {
    // Get the current cursor
    JTabletCursor cursor = jtablet.getCursor();
    fill(0);
    noStroke();
    ellipse(mouseX, mouseY, cursor.getPressureFloat() * 20, cursor.getPressureFloat() * 20);
  }
} 

That should do it.

You will probably want to download the SDK from the sketchstudio website.

This includes the .jar/.dll files along with the documentation.

If you want to make processing applets that work even if the user does not have JTablet installed, copy the jtablet.jar file to the sketch's data directory.

Marcello

Didn't see this reply till now (linked from processing hacks, ironically).

If the user has installed JTablet, you do not need to include either the dll or the jar, they'll automatically be found by the Java VM.  So in that sense, no you do not need to copy them to your code folder.

However, my recommendation would be to include the .jar file for applets.  The advantage is the applet will still load even if the user has not installed JTablet, but "new JTablet()" will throw an exception you can catch.

Marcello