  Conformo static charged dust distributions are investigated in the framework
of General Relativity. Einstein's equations reduce to a nonlinear version of
Poisson's equations and Maxwell's eqations imply the equaltiy of the charge and
mass densities. An interior solution to the extreme Reissner-Nordstrom metric
is given. Dust distributions concentrated on regular surfaces are discussed and
a complete solution is given for a spherical thin shell.
