Integrated Sachs–Wolfe effect in the era of precision cosmology

Recent detection of the Integrated Sachs–Wolfe (ISW) effect through correlation of the cosmic microwave background temperature anisotropy with traces of large scale structure provided independent evidence for the expansion of the universe being dominated by something other than matter. In these conference proceedings I discuss the extent to which future ISW measurements can help in precision tests of the physics responsible for the observed cosmic acceleration.