  We use free probability techniques for computing spectra and Brown measures
of some non hermitian operators in finite von Neumann algebras. Examples
include u_n+u_oo where u_n and u_oo are the generators of Z_n and Z
respectively, in the free product group Z_n*Z, or elliptic elements, of the
form S_a+iS_b where S_a and S_b are free semi-circular elements of variance a
and b. We give some pictorial evidence for connections with spectra of random
matrices.
