The exquisite cosmological information contained in the cosmological
microwave background has motivated an ambitious experimental program
that culminated recently with the success of the WMAP mission. But
whereas WMAP measurements delivered the answers we hoped for in terms of
basic cosmological parameters, it also made it clear that the next round
of questions will be very challenging ones. I will review in detail the
current observational and phenomenological successes as well as the
novel issues that arose, including the quest for a better understanding
of the physics of inflation and its relationship to the details of
reionization. I will highlight in particular how use will be made of
directly overlapping cosmological probes (gravitational lensing, galaxy
surveys, supernovae survey) in order to disentangle various physical
processes happening at different times.