Different Catia forums
http://www.mcadcentral.com/catia/forum/default.asp
http://www.3dcadforums.com/catia-forum.html
http://catia.cad.de/v5/forum.htm
http://v5.myigetit.com/floor/tips.aspx?selCategory=1&htips=1
http://catia.forumpro.fr/
http://www.catiav5support.se/
of course COE and this one.