It can be hard to get students excited about Early River Civilizations like Sumer, Assyria, Babylonia, India, China, and even Egypt. But, I've found some really helpful and engaging sites that I like to use. You can pull these together to create a webquest or just pull of few of these into your own lesson.
PBS: Guns, Germs, and Steel: Variables
Early River Civilizations Podcast - Listen to the podcast or download it to see the notes
The British Museum: Mesopotamia
Dig into History: Ancient Mesopotamia and then...Create an Exhibit (Requires Flash)
Play BBC's Pyramid Builder (Requires Flash)
The British Museum: Ancient India
The British Museum: Ancient China
Happy lessons!