  Prompted by recent progress in the study of N=4 super Yang-Mills amplitudes,
and evidence that similar approaches might be relevant to N=8 supergravity, we
investigate possible iterative structures and applications of Wilson loop
techniques in maximal supergravity. We first consider the two-loop, four-point
MHV scattering amplitude in N=8 supergravity, confirming that the infrared
divergent parts exponentiate, and we give the explicit expression which
represents the failure for this to occur for the finite part. We observe that
each term in the expansion of the one- and two-loop amplitudes in the
dimensional regularisation parameter epsilon has a uniform degree of
transcendentality. We then turn to consider Wilson loops in supergravity,
showing that a natural definition of the loop, involving the Christoffel
connection, fails to reproduce the one-loop amplitude. An alternative
expression, which involves the metric explicitly, is shown to have a close
relationship with the physical amplitude. We find that in a gauge in which the
cusp diagrams vanish, the remaining diagrams for this Wilson loop correctly
generate the full one-loop, four-point N=8 supergravity amplitude.
