Are the airport "taxi" plans available online? Whenever I sit in an aircraft and we taxi around the airport, I wonder how exactly is the airport organized, for example, the arrangement of the taxiways and runways.

Is it possible to locate airport diagrams? I'm mostly interested in Paris CDG, Prague PRG and Amsterdam AMS.
A great site to download airport diagrams and other charts is charts.aero. As of April 2015, however, the site seems gone.

Airport diagrams show all the taxiways and ramps, which is what you are looking for.

Keep in mind that this is an unofficial website. The charts should not be used for actual navigation.