automount and autorun

[Maurizio Marini]

My target is to use an "autorun" bash script when an usb pen is automounted 
like http://linlog.skepticats.com/content/udevautorun/ describe.

With recent kernels hotplug is vanished replaced by udev; there is 
no  /etc/dev.d or /etc/hotplug, anymore.
I am not able to find a place where put bash script to be executed.
I read tons of google udev links w/out result, yet.
Any advice would be apreciated

	Maurizio