Earlier today, I attended a talk summarizing the latest results from WMAP (three years of data were released) and, I must say, it's very exciting! The standard model has been confirmed to greater accuracy, the problematic aspects of the previous release have mostly vanished, and we have a whole new set of sky maps to look at! I'll summarize what they said at the talk, though I should note here that I have not worked with WMAP, so don't ask me detailed questions. The papers ought to be able to answer those for you. First of all, the reason it took them so long to process the data was that they were trying to remove the foregrounds in the polarization measurements. The primary foregrounds are from dust and synchrotron radiation, both of which are aligned with the galactic magnetic field. Thus, they had to develop a reliable model both for the magnetic field and the dust. In fitting to the standard cosmological model, they use six model parameters and they fit to both the temperature and polarization data. The standard model was well fit ([itex]\chi^2\simeq1.04[/itex]), as were some of the variations on it. Models using only ordinary (i.e. baryonic) matter were a very poor fit ([itex]\chi^2\simeq250[/itex]), and models without reionization and/or inflation were a poor fit as well. Since the error bars on the matter, baryon, and dark energy content of our universe were small in the first year results, we didn't expect anything groundbreaking in that arena. We appear to live in a universe composed of ~73% dark energy ~23% dark matter ~ 4% ordinary matter The various surveys disagree at the few percent level about the first two numbers. WMAP alone gives error bars of a few percent on the measurement of the matter content of the universe. The universe is also consistent with being perfectly flat. One way to give this result is to say that the effective energy density of curvature is less about 2%. The best fit model is slightly curved, but this result is not statistically significant. But that was all old news. What's new? Well, for starters, the total optical depth to the surface of last scattering (where the CMB was created) has been reduced significantly since the first release. This means that they're estimating the first stars to have formed around z~11 (rather than z~17) and we expect that the universe to had begun reionizing itself at around the same time. This is good because it's more consistent with observations of quasars that show partial reionization to be occurring at z~6. This is a result that came from the polarization data, so we wouldn't have had it without the extra time they took to make the release. Other big news is that the primordial power spectrum is more clearly not consistent with scale-invariance. This means, basically, that we have confirmed another prediction of inflation. In addition to these new measurements, the third-year release features a glitchless power spectrum, less deviation at the low-l multipoles, extremely gaussian fluctuations (another prediction of inflation), model consistency with other CMB experiments, a dark energy equation of state still consistent with -1 (cosmological constant), and even some interesting results about spinning dust grains. There is much more I could talk about, but I'd rather hear what people think first.