similar to hometoys. check out the page of home wiring ideas.

smart homes for dummies
by danny briere
extremely easy to understand and impressively up-to-date home technology resource

this wired home: the microsoft guide to home networkingthird edition
by alan neibauer
a detailed but still readable guide to networking home computers

home theater for everyone: a practical guide to today’s home entertainment systems
by robert harley with foreword by tomlinson holman
great balance between technical detail and overall readability. covers components, wiring, and even history