usb tiny isp programmer / user accessible

To make an usbtiny programmer usable directly as user from avrdude or the arduino toolkit, add the following line to a new file in /etc/udev/ :

ATTRS{idVendor}=="1781", ATTRS{idProduct}=="0c9f", MODE="0664", GROUP="plugdev"
I created a file called /etc/udev/joost.rules with this line.
Reload udev with /etc/init.d/udev reload