  Much evidence suggests that we live in a flat Cold Dark Matter universe with
a cosmological constant. Accurate analytic formulae are now available for many
properties of the dark halo population in such a Universe. Assuming current
``concordance'' values for the cosmological parameters, we plot halo abundance
against redshift as a function of halo mass, of halo temperature, of the
fraction of cosmic matter in haloes, of halo clustering strength, and of the
clustering strength of the z=0 descendants of high redshift haloes. These plots
are useful for understanding how nonlinear structure grows in the model. They
demonstrate a number of properties which may seem surprising, for example: 10^9
solar mass haloes are as abundant at z=20 as L_* galaxies are today; 10^6K
haloes are equally abundant at z=8 and at z=0; 10% of all matter is currently
in haloes hotter than 1 keV, while more than half is in haloes too cool to trap
photo-ionized gas; 1% of all matter at z=15 is in haloes hot enough to ionise
hydrogen; haloes of given mass or temperature are more clustered at higher
redshift; haloes with the abundance of present-day L_* galaxies are equally
clustered at all z<20; the metals produced by star-formation at z>10 are more
clustered at z=0 than are L_* galaxies.
