How old is your child? This past year, we got our DD (who is 3 now) a T-shirt that says "I <3 My Cardiologist" from Cafe Press. We took a picture of her wearing the shirt, (at Disney!) framed it and gave it to her along with a nice note about how much we appreciate her (and wore the shirt to our next appointment). She got a HUGE kick out of the shirt and took pictures on her I-phone so she could "show people on the go." We've also gotten her wine in the past as we know she loves wine. We picked either J. Lohr (since that's her name) and some from winemakers who were doctors!
We also penned a seperate letter to the University and the Hospital about how pleased we were at the care we received at the Heart Center. We had a paragraph about the care in general and then had a paragraph each for 3 specific doctors who have gone over and beyond. I tried to be very specific about how they sought out second opinions for us, presented us with specific stats and studies when we ask questions, etc. I was told the letter had made it's way to all the Head Honchos before it got to the doctors, but that they hung it on their break room door and that everyone was so thrilled with the letter, she said some were in tears. So the written word does carry huge weight!