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I don't think there's anyone writing better, more actionable advice on this particular transition than Michael Lopp at http://randsinrepose.com

I'd read everything on that site.

Seconded. If paper form is more your thing, I've found his compilation book "Managing Humans" (http://www.amazon.com/Managing-Humans-Humorous-Software-Engi...) to be a great place to start.