  In the first part of these notes, we review some of the recent developments
in the study of the spectral properties of Wigner matrices. In the second part,
we present a new proof of a Wegner estimate for the eigenvalues of a large
class of Wigner matrices. The Wegner estimate gives an upper bound for the
probability to find an eigenvalue in an interval $I$, proportional to the size
$|I|$ of the interval.
