The 300

In March of 2007, The 300, based on the graphic novel by Frank Miller, and filmed entirely in HD, will hit theatres. The movie is about the Battle of Thermopylae. From wikipedia:

"In the Battle of Thermopylae of 480 BC an alliance of Greek city-states fought the invading Persian army in the pass of Thermopylae. Vastly outnumbered, the Greeks delayed 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. The Persians succeeded in defeating the Greeks but sustained heavy losses, disproportionate to those of the Greeks. A local resident named Ephialtes betrayed the Greeks, revealing a mountain path that led behind the Greek lines. Dismissing the rest of the army, King Leonidas stayed behind with 300 Spartans and 700 Thespian volunteers. Though they knew it meant their own deaths, they secured the retreat of the other Greek forces."

The trailer looks completely awesome. There's rhinoceros warfare, a frighteningly badass kid, and some intense looking battle scenes. Check out the trailer in HD here.