2-jet cross sections as functions of different jet kinematic variables are measured in photoproduction using the H1 detector at HERA. The data sample comprises e+p data collected from 1995-97. Jets are found using the longitudinal kt algorithm in the laboratory frame and requiring the highest tranverse momentum jet to have at least 25 GeV. These high E_T jets provide stringent tests of pQCD and of structure functions of the photon and proton.