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Most of the big mound sites have their own web page. Several of the official web pages for some of the most important sites are listed here.
Cahokia: http://cahokiamounds.org/
Moundville: http://moundville.ua.edu/
Etowah: http://ngeorgia.com/ang/Etowah_Indian_Mounds_State_Historic_Site
Town Creek Mound: http://www.nchistoricsites.org/town/town.htm
Ocmulgee Mounds: http://www.nps.gov/ocmu/index.htm
Hopewell Culture National Park (Mound City): http://www.nps.gov/hocu/historyculture/index.htm
These videos are brief, but informative:
This is the video produced by Cahokia Mounds State Historic Site (it’s the introductory video you see in the museum before you visit the mounds themselves):
https://www.youtube.com/watch?v=7Dp1CViqb5Y
Illinois Adventure #1308 is another interesting video about Cahokia: