Exposé no longer respects the relative sizes of windows
Although Exposé has been vastly improved in Snow Leopard, Apple did let go of one of its great qualities in doing so. Under Leopard, although the windows were haphazardly thrown together instead of being neatly organized in a grid, they were all displayed at relatively correct sizes. So if you had a long and narrow Safari window beside a shorter and wider one for Mail, they would retain their relative dimensions even in their pint-sized Exposé thumbnails.
This is something I really miss in Snow Leopard. “I know I had a small Safari window somewhere BUT WHERE DID IT GO oh shit it somehow smacked my face without me noticing it”

