I agree - Cyrilla for Singing Minister !
David - I see your point about not starting too young, but there's actually no physical reason why not if the technique being taught is sound, they can start as young as you like - the only thing being that they have a short attention span and probably won't practise much. I find that with guys, I don't start until after they've finished the voice break stage (but wouldn't turn away a young chorister, for example) and with girls, I aim for no younger than 14, but that's just my personal preference when it comes to working with children.
Encouraging them to build healthy vocal habits (especially things like deconstriction / open throat) is essential really - often when we try to let them 'do it as mother nature intended' we forget that she didn't intend at all and that some basic pointers on healthy sound production are necessary to avoid messing up their voices - things like, keep it light but not breathy, open throat etc are probably enough and if combined with some fun choral exercises (or the Rather Fabulous Cyrilla book for kiddies

) could be of great use to younger children in helping them to develop a love of music and a lack of fear.
I agree that it's not worth going into too much detail on the technical front until they need to attack more complex stuff, by which time they'll have decided if they want to learn how to sing properly anyway.