Aeroports de Paris
Official French airports website with information on Charles de Gaulle and Orly airports. Just click on the link marked "Welcome" for the English language version.
http://www.adp.fr/

Airwise.com
Airwise.com is an unofficial website with information about Charles de Gaulle Airport, including details of the airlines operating from it.
http://www.airwise.com/airports/europe/CDG/index.html

Airwise.com
An unofficial source of information about Orly Airport that a includes a list of airlines flying to it.
http://www.airwise.com/airports/europe/ORY/index.html

A-Z World Airports
Information about Reims-Champagne Airport, which is about an hours drive from Paris.
http://www.azworldairports.com/airports/p1570rhe.htm

Columbus Guides
Check out maps of the terminals at Charles de Gaulle and Orly.
http://www.worldairportguide.com/region/eur.asp

Paris Beauvais Airport
Beauvais is a small airport served by some European budget airlines.
http://www.aeroportbeauvais.com/airport/

Paris Charles de Gaulle Airport
Unofficial guide to CDG.
http://paris-cdg.com/index.html

Paris.org
Useful advice on how to get to and from Paris' main airports using public transport.
http://www.paris.org/Accueil/Airport/