Great Wall generalities

-An article on the discovery of the Xinjiang section of the wall
-Short histories of the Great Wall can be found here and here
-For those who are very interested and have more time can check the Meet Great Wall site, with its extensive history on the subject. *

Everyday life in Han and Ming

-A very good site to explore different aspects of the Han and Ming dynasties, made of very short articles on each subjects: Chinaknowledge (Under History, select Han and Ming, where other links to different sections expect you. There's also a history of the Great Wall in the same History section under Qin, and several articles on the arts in general)
-A very good article about Daily life in Han times, and easy to read too
-Asian Spirit (focuses on the developement of art, esp. pottery): Han/Ming
-A few tidbits on Daily Life in Ming
-Exhibit and informations on Han tombs artifacts (great site!)

* From the Meet Great Wall site listed above, you may want to visit some pages to learn more about the people who built it and their working conditions. Also, if you're interested in being a farmer or a soldier, you may want to read the article on the farming-garrison system along the Wall (for both, go to "The Great Wall of China -> The Walls Before the Wall. Links are near the bottom of that list.)