  I discuss how parameters describing inflation in the very early universe may
be related to primordial perturbation spectra. Precision observations of
anisotropies in the cosmic microwave background (CMB) such as those provided by
the WMAP satellite offer an unprecedented window onto the physics of the very
early universe. To theorists exploring speculative models of physics at high
energies, the CMB offers us the chance to put our ideas to the test.
