I don't care what color the bars are, but they should be wider. It's a pain in the ass having to align each window right at the right edge of the screen.
Since iTunes is not part of Leopard, I would think no. It is strange though that Apple did not change the scroll bars to match iTunes. I thought that was the new direction for the appearance of the OS X. I'll take either the Aqua blue or the gray (?) scroll bars as long as it is consistence.
I have a feeling iTunes will receive a Leopard update shortly. Currently the top left close buttons are using the Tiger colors and not the new brighter Leopard colors.