Useful music related resources for ward musicians/ward choir directors:
lds instructions for the ward choir director, from lds.org, also has a link to the hymnbook section on ward choir songs/arranging songs for ward choirs.
http://www.emilyspencer.com seems to have lots of arranging advice.
lds church music site map has links to various resources
https://sites.google.com/site/ldsfamilyresources/home/music-training has a "conductor guide" or some odd.
thewardchoir.com Mormon blog with music/other mormon content
http://sites.google.com/site/wardchoirhelp2/ Some song lists, choir director helps/suggestions.
http://www.soundsmithmusic.com/composing-arranging/ Some arranging tips.
http://www.wardchoirguy.com/blog-the-choralator.htm has some helpful blog posts
lds hymn music 01 tips for choir directors