Time-dependent density functional theory: Past, present, and future
  Time-dependent density functional theory (TDDFT) is presently enjoying enormous popularity in quantum chemistry, as a useful tool for extracting electronic excited state energies. This article discusses how TDDFT is much broader in scope, and yields predictions for many more properties. We discuss some of the challenges involved in making accurate predictions for these properties. 
Kieron Burke, Jan Werschnik, E.K.U. Gross