for HMI visualization you can use our Software VisBee.
Actually we are working on the driver to communicate between ARDUINO and our visualization Software VisBee.
MODBUS (and others) is already working.
It’s a fully loaded professional Visualization system for HMI and SCADA.
You can download the Software without any restrictions at www.visbee.de
The is a extra version for ARDUINO - Fans ;-) (VisBee-light)
The driver will be available during march/april 2013.
If you have further questions let me know.....