  We discuss the possibility to identify anisotropic and/or inhomogeneous
cosmological models using type Ia supernova data. A search for correlations in
current type Ia peak magnitudes over a large range of angular scales yields a
null result. However, the same analysis limited to supernovae at low redshift,
shows a feeble anticorrelation at the two sigma level at angular scales of
about 40 degrees. Upcoming data from, e.g., the SNLS (Supernova Legacy Survey)
and the SDSS-II (SDSS: Sloan Digital Sky Survey) supernova searches will
improve our limits on the size of - or possibly detect - possible correlations
also at high redshift at the per cent level in the near future. With data from
the proposed SNAP (SuperNova Acceleration Probe) satellite, we will be able to
detect the induced correlations from gravitational lensing on type Ia peak
magnitudes on scales less than a degree.
