No vector format? Don't get me wrong, these flags are appreciated, but to spend all that time making them in a bitmap format? Kinda seems like a bit of a waste, since flags seem PERFECT for vector format.
If you want vector flags use wikiepedias SVG flags. These are made to be pixel perfect at different sizes, something that wouldn't work if we just batched them all from vectors.
http://commons.wikimedia.org/wiki/Sovereign-state_flags