Paris - Getting from the airport

Getting from the airport:

If you land in Paris, you'll land in one of two airports, CDG (Charles de Gaulles, called also Roissy) or Orly. CDG is North of the city, Orly is south of the city.
In CDG you have the old fashioned CDG1 or the newer CDG2.

How to get from the airport:

Taxi:
Orly is closer so taxi will be cheaper. A taxi to the centre of Paris should cost around €30.
CDG is quite far and count on €50 for a taxi.

Train:
I started writing a long article until I found a website, Paris by Train, made using Drupal and does it better than me.

Orly: http://parisbytrain.com/transportation-paris-orly
CDG: http://parisbytrain.com/charles-de-gaulle-airport-cdg-to-paris-by-train
CDG by bus: http://parisbytrain.com/buses-from-cdg-airport-to-paris