rataweb:
I tried to program my ATtiny85 with the example. I connected 'PB4' (tx) with 'TX0->' (tx to tx), but the serial communication with the Arduino IDE (using Mega 2560) doesn't work... :(.
I'm not surprised. You're connecting two outputs. You need to connect an output to an input...tx to rx (and rx to tx for 2-way comms).