Like Toast said, please say goodbye one way or another....when pilots switch without some sort of acknowledgment, I don't know if you heard me. When I try again and you don't answer, I don't know if you switched without saying goodbye or if you're NORDO, so now I have to call the next guy, who might be busy, and find out if you're there.

And please use your callsign with every readback. I might know it was you, but the FAA is putting procedural errors on controllers because the only pilot on freq didn't use his callsign and the controller didn't go back and make the pilot read back the instruction and callsign in the same transmission.