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In Classic, F1 will still bring up Windows help.

I usually start with the local help; it usually saves me a search and wading through results. If I can't find an answer there, then I turn to Google.

I can't say beyond that. I'm in an SCCM class this week, without access to the W8 system I built at work last week. I can't speak to Metro apps; none of the default ones interested me. Most of my experience with them was 'open, see that it requires a Live account, close, delete tile'. I also haven't had time yet to load any 'conventional' applications - Office, FF, etc.
Updated - 5th Dec