To get things started...here are a few links:

http://www.easy502nd.com/history.htm

http://www.ww2-airborne.us/units/502/502.html

http://www.airborne101st.com/

http://www.504th.freeserve.co.uk/502norm.htm

http://www.101airborneww2.com/

New:

http://www.paratrooper-museum.org/about.html