Catholic Pages Directory – an excellent directory of Catholic sacred art               http://www.catholic-pages.com/dir/art.asp

Christus Rex project - a wonderful collection of over 5000 pieces of sacred Art

http://www.christusrex.org/www2/art/gallery.htm

Sacred Art: a Rebirth?  T
This article features one of the Founders of Epiphany Sacred Arts Guild  
http://www.catholicculture.org/library/view.cfm?recnum=688

The New Liturgical Movement -
http://thenewliturgicalmovement.blogspot.com/  #NLMresources

Architecture

Church Architecture and Renovation
http://www.adoremus.org/ArchArticles.html

The Institute of Sacred Architecture 
http://www.sacredarchitecture.org/index.html

So, You're on the Parish Building Committee? - An architect's list of useful resources on church architecture
http://www.adoremus.org/299McNamara.html

Iconography
 

Atrlier St. Andre – a very thorough introduction to iconography
http://www.atelier-st-andre.net/en/index.html

The Icon Workshop of Saint Gregory of Sinai Monastery  http://www.gsinai.com/rw/icons/icon_workshop.php

Mosaic

http://www.gsinai.com/rw/icons/mosaics.php