http://www.kerozen.org offers a wealth of updated infos about both CDG and ORY spotting locations. In fact they are tons of sites from lots of airports. Some I remember by heart
http://www.samchui.com SYD
Otherwise also try
http://www.justplanes.com click on airline links when at home page
then select photo&spotting
behind a city name usually hides a locally based spotter's site
Alain