Interesting post. I definitely notice a very deep blue sky in the moutains as opposed to Wisconsin. I attribute this to less pollution, dust, haze, etc. And of course the higher you are, the less sky you shoot through. Now add a polarizing filter and the sky becomes a very dark blue.

I like the effect on the sky mainly because I can't replicate it here in the semi-flat lands. Now a blueish hue to an entire image, that's not good. I suppose PhotoShop experts can fix it, but the better the raw image is, the easier it is to produce a nice print.

-Dave-