Flags of Arabia
Curzon at Coming Anarchy provides us with a brief explanation of why so many Arabic speaking countries have very similar flags, featuring a flaggish map!
Flags of Arabia, Part 2: Flags of the Arab Revolt, the Hashemite Kings, and Pan-Arabism
Flags of Arabia, Part 1: The Trucial States of the Persian Gulf
The Crescent and Sacred Green: A Postscript to the Arab Flags Series