  Measurements of CMB anisotropy and, more recently, polarization have played a
very important role in cosmology. Besides precise determination of various
parameters of the `standard' cosmological model, observations have also
established some important basic tenets that underlie models of cosmology and
structure formation in the universe -- `acausally' correlated, adiabatic,
primordial perturbations in a flat, statistically isotropic universe. These are
consistent with the expectation of the paradigm of inflation and the generic
prediction of the simplest realization of inflationary scenario in the early
universe. Further, gravitational instability is the established mechanism for
structure formation from these initial perturbations. Primordial perturbations
observed as the CMB anisotropy and polarization is the most compelling evidence
for new, possibly fundamental, physics in the early universe. The community is
now looking beyond the parameter estimation of the `standard' model, for
subtle, characteristic signatures of early universe physics.
