300 the movie is a retelling of the ancient Battle of Thermopylae in
which King Leonidas and 300 spartans fought to the death against Xerxes
and his massive Persian army. Facing insurmountable odds, their valor
and sacrifice inspire all of Greece to unite against their Persian enemy
drawing a line in the sand for Democracy.
Frank Miller adapts Greek History as a superhero tale and adds to it elements from comics, which make the film more thrilling.
The official website is http://300themovie.warnerbros.com/ and you can learn more about the cast, watch trailers, and download wallpapers, screensavers and more goodies.
To learn more about the Battle of Thermopylae you can go to Wikipedia
where are extensive information about this glorious battle http://en.wikipedia.org/wiki/Battle_of_Thermopylae