A visually stunning movie for 2007! Another Frank Miller (the guy behind Daredevil, Batman and Sincity) movie! BTW, I've heard that the reason the Spartans wore red clothes so the enemy could not see their blood. Wondering if it's true. Anyways, I will definitely go and watch this movie!
Here's some historical background about this movie (quoted from Wikipedia):
In the Battle of Thermopylae of 480 BC an alliance of Greek city-states fought the invading Persian army in the mountain pass of Thermopylae. Vastly outnumbered, the Greeks held back the enemy in one of the most famous last stands of history. A small force led by King Leonidas of Sparta blocked the only road through which the massive army of Xerxes I could pass. After several days of confrontation the Persians attacked but were defeated by heavy losses, disproportionate to those of the Greeks.
This continued on the second day but on the third day of the battle a local resident named Ephialtes betrayed the Greeks, revealing a mountain path that led behind the Greek lines. With the rest of the army dismissed, King Leonidas stayed behind with his bodyguard of 300 Spartans and the 700 man Thespian army even though they knew it meant their deaths, to allow the rest of the army to escape.