  A number of features and applications of subleading color amplitudes of N=4
SYM theory are reviewed. Particular attention is given to the IR divergences of
the subleading-color amplitudes, the relationships of N=4 SYM theory to N=8
supergravity, and to geometric interpretations of one-loop subleading color and
N^k MHV amplitudes of N=4 SYM theory.
