The Birds of Mexico (Las Aves De México)

Introduction
This post has been moved to the following two links:
Passerine birds - http://mexicanjajean.blogspot.mx/2012/03/birds-of-mexico-aves-de-mexico.html
Non-Passerine birds - http://mexicanjajean.blogspot.mx/2012/03/birds-of-mexico-aves-de-mexico-non.html

A few good online resources for identifying Mexican birds include:

Aves de Mexico (upload photos and share sightings): http://www.avesdemexico.net/
CONABIO (photos and information on distribution): http://www.biodiversidad.gob.mx/especies/aves.html
Wikipedia's list of of birds in Mexico (photos and descriptions): http://en.wikipedia.org/wiki/Category:Birds_of_Mexico
Birds of Mexico (photos and sounds): http://www.birdsofmexico.com/
EBird Mexico (submit observations and view sightings): http://ebird.org/content/ebird/averaves
Bird Sounds: http://www.xeno-canto.org/
The Audubon Society of Mexico: http://www.audubonmex.org/

And, my favorites from home: 
www.friendsoftimesbeachnp.org/blog.html
http://protectionfarmjournal.blogspot.com/
http://nicksbirdblog.wordpress.com/
http://www.facebook.com/pages/GreenWatch/140401049308745

Local Bird Clubs: 

Club de Observadores de Aves de Puebla (COAP): https://sites.google.com/site/coapmx/  and http://clubdeobservadoresdeavesdepuebla.blogspot.com/

Club de Observadores de Aves de Xalapa (COAX): http://www.coaxxalapa.org/