In this talk I'll review results from the Atacama Cosmology Telescope (ACT). ACT is a millimeter-wave telescope which has just completed a 1000 square-degree survey at arcminute resolution from 5200m in the Atacama desert of northern Chile. I will discuss our current inventory of galaxy clusters discovered through the Sunyaev-Zel'dovich effect (SZ) and highlight how a consistent cosmological picture is emerging from the cluster counts and the SZ contribution to the spatial power spectrum of the millimeter sky, systematics notwithstanding.
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