#1-Icon Sizes:
When I download an IP, I like to see XP icon sizes 128-96-72-64-48-32-24-16. If the extra icons for the older operating systems are included, there should be 256 color icon sizes 48-32-24-16.
16 color icons are hideous and almost nobody needs them anymore. (I delete them if included). I also delete true color icons because Windows can be lazy and show them instead of the XP icons. (You lose the shadows)