thank you, Jeff. 
I didn't test I2C yet as I have to rebuild my testsetup for that. (Not a big deal though, it just happened that I received a new EthernetShield on monday and stripped the breadboard to get it working with NANO)
Features I testest so far are Digital-I/O and Analog-Input, OneWire and Scheduler. Have to buy a real servo to test that.