I actually heard this one on Saturday (I live in the Clearwater/St. Petersburg, FL area) while runing errands and scanning for pirates. Which is what I thought this was (possibly from the Tampa side of the bay, due to very poor signals, and I never caught any spots).
I checked the FCC calls dB upon returning home and also found a Radio & Records 8/10/2006 post about the flip and new calls. Surprised to hear it down here under seemingly non-tropo conditions, much less only four days after the new calls went into use.