  The early 1990s saw the first useful application of pulsed neutron
spectroscopy to the study of excitations in low dimensional magnetic systems,
with Roger Cowley as a key participant in important early experiments. Since
that time the technique has blossomed as a powerful tool utilizing vastly
improved neutron instrumentation coupled with more powerful pulsed sources.
Here we review representative experiments illustrating some of the fascinating
physics that has been revealed in quasi-one and two dimensional systems
