Here's the Serenity making a cameo appearance in the pilot for Battlestar Galactica, via Whedon.info.
Update: From Facebook via Reddit the person responsible for this Easter Egg shares a little more information:
Jarrod Davis: This is not exactly NEWS, since it's about 7 years old now, but in case anyone was wondering: Yes, it was me. I put Serenity in the Battlestar Galactica pilot. :) I think Lee Stringer was the first to suggest we needed to do it somewhere. Those shots of Laura in the doctor's office needed air traffic, and it was just too good to pass up.
(Editor's Note: Images of the Day aren't meant to be "news," they are simply interesting images we come across that we think are worth sharing and that haven't been seen on Blastr before. In many cases the older the image -- like a young Ian McKellen looking impossible cool -- the more interesting they are.)