As for sprawl the best thing that I know of is Portland Oregon, one of the few larger cities in the US that placed a expansion boundary on a city that was not geographically bounded on three of its sides (it has agricultural and environmental open space on the three sides, and a river to its north) as for in fill are you looking for good or bad examples, newer or older? as for philosophy there is a great book The New Urbanism: Toward an Architecture of Community by peter Katz that explores a number of infills and urban projects. Not all of the projects have been successful but that is for you to decide right?