Thanks for the great site. I almost never take a trip without checking out seatexpert.com.
I usually prefer aisles when I travel on business, so the windows are less of an issue for me.
That being said, when I travel with my family or on the rare occasion that I get a window seat on a business trip, the windows become a bigger part of the seat selection process.
My occasional use of the window information is probably not enough for me to justify asking you to spend time to add it to your site. But if you decide to add it, I will use that information.