  The cosmological dust has begun to settle. A likely picture is a universe
comprised (predominantly) of three components: ordinary baryons ($\Omega_B
\approx 0.05$), non-baryonic dark matter ($\Omega_{Dark} \approx 0.22$) and
dark energy ($\Omega_{\Lambda} \approx 0.7$). We suggest that the observed
similarity of the abundances of ordinary baryons and non-baryonic dark matter
($\Omega_{B}/\Omega_{Dark} \approx 0.20$) hints at an underlying similarity
between the fundamental properties of ordinary and dark matter particles. This
is necessarily the case if dark matter is identified with mirror matter. We
examine a specific mirror matter scenario where $\Omega_B/\Omega_{Dark} \approx
0.20$ is naturally obtained.
