Conway's Game of Life - Conventional JavaScript?
Looks quite good overall; not much to criticise. (I'm not looking at the overall structure or logic - just the style; the game of life can be written in so many ways)

Anyway, what I have is very trivial:


Missing indentation in the bodies of tick and getLiveNeighbourCount
Don't use a for...in loop for arrays (in isCellAlive); better and clearer to use a regular for-loop like you do elsewhere.
You ought to define myapp as window.myapp. Right now it's implicitly global, because it's missing a var declaration, but you might as well make that explicit (or perhaps it doesn't need to be global at all?)
Some more comments in the code itself would probably be nice.