I didn't want to stomp on other people's threads, so I am starting my own. I don't have a SPL Meter, but my Pioneer Elite VSX-54TX has a RS232 port on the back that allows me to connect a computer, run their "professional" EQ MCACC stuff and output the data to my computer.
Anyway, I ran it tonight, and came up with some pretty graphs.
The room is very (VERY) unusually shaped (I'll post a diagram later) with no treatments outside of carpet and the couch.
First up, each channel's frequency response in my room.
FRONT LEFT
FRONT CENTER
FRONT RIGHT
SURROUND LEFT
SURROUND RIGHT