The unprecedented high intensities made accessible by the development
of ultrashort pulse laser systems have uncovered a host of new phenome
na and changed the way that we think about atomic and molecular dynami
cs. We review these developments in the context of some of the basic m
odels that have evolved to explain them. The successes and limitations
of simple semiclassical models of strong-held atomic phenomena are di
scussed. Photodissociation dynamics have shown a rich complexity in st
rong fields-bond softening, above-threshold dissociation, coulomb expl
osion-which we review. The promise of the new laser systems in the fie
ld of coherent control of molecular dynamics is also discussed.