Just curious about ways to maybe save bandwidth for little mediawiki installations as well as wikipedia:
Have the logos at the bottom of the screen, background images use the central wikimedia ones ("hotlinked") instead of the ones that come from the distribution .tar. And on the central wikimedia ones, have Expires: Jan 1 2036 etc. HTTP header. Result: one copy cached forever on the whole Internet? If one day regret Expires 2036, then just change the filename when needed. Or maybe expires 1 year form now, etc.
Maybe also somewhat for .css.