Lots of demos for you to try this weekend, and the latest one is from the Rise of Nations people, with a demo to try out the Rise of Legends game. You’ll have to download 620MB and it comes with a campaign and skirmish mode, and be able to choose from one of three races. Info from the official site:

In Rise of Nations: Rise of Legends™ you lead vast fantasy armies into massive, strategic battles, raise your civilization from a tiny village to globe-spanning empire, and help guide a young inventor’s struggle to unravel his world’s ancient past and unite its people against an unimaginable threat!