  We present a semiclassical approach to eigenfunction statistics in chaotic
and weakly disordered quantum systems which goes beyond Random Matrix Theory,
supersymmetry techniques, and existing semiclassical methods. The approach is
based on a generalization of Berry's Random Wave Model, combined with a
consistent semiclassical representation of spatial two-point correlations. We
derive closed expressions for arbitrary wavefunction averages in terms of
universal coefficients and sums over classical paths, which contain, besides
the supersymmetry results, novel oscillatory contributions. Their physical
relevance is demonstrated in the context of Coulomb blockade physics.
