  We use our resummed quantum gravity approach to Einstein's general theory of
relativity in the context of the Planck scale cosmology formulation of Bonanno
and Reuter to estimate the value of the cosmological constant as \rho_\Lambda
=(0.0024 eV)^4. We show that the closeness of this estimate to experiment
constrains susy GUT models. We also address various consistency checks on the
calculation.
