I've done a 180 on this one. I was always of the mind that I'd alert the LEO to the fact that I was armed, but after speaking to numerous LEOs on the subject I've changed my mind. The story was pretty much the same - sure, the LEO would appreciate it but it's not worth the trouble if you're stopped by a skittish cop, rookie, etc. None of the cops said they'd be angry if the person didn't volunteer that they were legally carrying.
I won't bring the subject up.
(Insert random tough-guy quote here)
"See my gun?? Aren't you impressed?" - Anonymous sheepdog
Guns - the alternative to running for your life.