The article Excitation energies in density functional theory: An evaluation and a diagnostic test by M. J. G. Peach, P. Benfield, T. Helgaker and D. J. Tozer, J. Chem. Phys. 128, 044118 (2008) is the mosted cited paper published in the Journal of Chemical Physics in 2008, among a total of 2865 papers published in that journal in 2008. Twenty months after its publication, it has already been cited 45 times, compared with 27 citations for the second and third most cited papers that year.