Since 1.03 hit, this is one of the most popular Act 1 runs. People immediately began to start farming elites and this is by far the most efficient and lucrative run. With the change in 1.03 so that elite packs now guarantee a rare (w/five stacks), wasting five stacks of Nephalem Valor and repeating the run is simply not as efficient as pre-1.03. The video below highlights several areas that guarantee elites and have the highest elite density in Act 1. Act 1 is especially great, because there are relatively small areas with concentrated numbers of elites. These runs still normally culminate in the killing of the Warden and Butcher. The areas covered are:
The Watchtower (1-5 elites)
The Festering Woods (2-4 elites)
Leoric’s Manor (and courtyard) (1-2 elites)
Cemetery of the Forsaken (and the Defiled Crypts) (3-4 elites, sidequest)
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Source: http://www.diablo3strategyguide.com/inferno-act-1-runs