One thing I've noticed is that on my 2004 (as well as on my previous 98 that had the antenna in the rear glass), that FM reception goes to hell the second you turn on the rear defroster. Anybody else experience this?

Of course, with factory XM, who needs FM anymore?
(That is, unless I'm heading South and my sunroof is open, then it blocks the satellite signal to my XM antenna. Grrr.)

So, if my rear window is foggy, and I'm headed south with the sunroof open...there's always that six-disc CD changer.