  The Wavelength-Oriented Microwave Background Analysis Team (WOMBAT) is
constructing microwave maps which will be more realistic than previous
simulations. Our foreground models represent a considerable improvement: where
spatial templates are available for a given foreground, we predict the flux and
spectral index of that component at each place on the sky and estimate
uncertainties. We will produce maps containing simulated CMB anisotropy
combined with expected foregrounds. The simulated maps will be provided to the
community as the WOMBAT Challenge, so such maps can be analyzed to extract
cosmological parameters by scientists who are unaware of their input values.
This will test the efficacy of foreground subtraction, power spectrum analysis,
and parameter estimation techniques and help identify the areas most in need of
progress. These maps are also part of the FORECAST project, which allows
web-based access to the known foreground maps for the planning of CMB missions.
