Would it be possible to have a hash of a sites icon so that you only have to download when it's changed. Or is this already implemented with HTTP cache or something like that (if it is could someone explain how you get the hash)?

Also could a link between the meta sites and their parent, like a parent_site_url or parent_site_name

(also meta stackoverflow's state is listed as normal, not linked_meta)

EDIT: Also the sites that are in beta, should their meta sites also be in beta it would make organizing a lot easier.