There is a demo out for this game. Get it here:
http://www.microsoft.com/games/ageof..._downloads.asp
It's 337MB
. However, it's definitely worth leaving your PC running overnight, or while you're at work, to download it because it is an awesome game!
I liked Age of Empires/Kings, but I was never a huge fan. This game takes the series to a whole new level, though. The introduction of the Major and Minor Gods bring a good blend of strategy into the game. Also, the Myth and Hero Units are just very very cool.
The graphics kick ass too.
And the campaign mode has a well written script, good voice-acting and nice frequent cut-scenes.
The Demo lets you play the Tutorial, the first 2 levels of the Campaign, and Skirmish games on 2 pre-made maps.
It only lets you play as Zeus, though - the other 8 Major Gods are saved for the retail version.
Highly recommended!