Growing Pains

What distinguishes the companies that expand at light speed from the ones that always remain small? What did Google and hundreds of other companies do differently that allowed them to achieve incredible success, while thousands of small businesses remain just that: small.

I don't have an answer. I want to know, because I believe I will be faced with that sooner or later (hopefully sooner!). How does a company handle sudden growth?

Does anyone have any recommendations? Books? Anything?