Hi, I have been using pduino with my Arduino just fine with the analog inputs, but am having trouble trying to use my Parallax Ping))) Ultrasonic Range Finder with the digital inputs to get the range finder values into PD.

Can anyone help? Any suggestions?

The Parallax Ping Ultrasonic sensors require a special firmware to use them. You won't get any data from them using just a digital in or analog in. If you want a very easy to use ultrasonic sensor, I recommend the Maxbotix ones. They output an analog signal, here's one of them:
http://www.sparkfun.com/commerce/product_info.php?products_id=639

To use the Parallax sensor, basically, you can get the Parallex Arduino firmware from the Arduino forums, then use the Arduino Firmata library to set up the communications.

Thanks Hans. The Ping))) works with the Arduino in a digital pin over the serial communication just fine and can get the measurements to read out into the Arduino serial monitor window.

I will try the one you suggest since analog ins work just fine with me and pduino, thank you for the tip.