CRUTCHFIELD ARTICLES
Home theater and whole house audio system planning guide by Ralph Graves
Multi-room audio buying guide by Jim Richardson
In-wall wiring guide for home A/V by Tara W.
In-wall and ceiling speaker placement by Joshua Crane
In-wall and ceiling speakers buying guide by Joshua Crane
Powering your multi-room music system by Deia Z.
In-wall wiring guide for home A/V by Tara W.
Video: Installing In-wall and In-ceiling Speakers — The Basics by Video Team
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Speaker selector
http://www.audiogurus.com/learn/speakers/using-speaker-selector-switch/502
http://www.audioholics.com/diy-audio/how-to-use-a-speaker-selector-for-multi-room-audio