  Although the currently favored cold dark matter plus cosmological constant
model (LCDM) has proven to be remarkably successful on large scales, on
subgalactic scales it faces some potentially fatal difficulties; these include
over-producing dwarf satellite galaxies and predicting excessive central
densities in dark halos. Among the most natural cosmological solutions to these
problems is to replace cold dark matter with a warm species (LWDM). The warm
component acts to reduce the small-scale power, resulting in fewer galactic
subhalos and lower halo central densities. An alternative model with a mild
``tilt'' in the inflationary power spectrum (TLCDM; n =0.9) similarly reduces
the central densities of dark halos, although the substructure abundance
remains relatively high. Here I argue that because dwarf galaxy formation
should be suppressed in the presence of a strong ionizing background, favored
LWDM models will generally under-predict the observed abundance of dwarf
galaxies. The satellite count for TLCDM fairs much better, as long as the
photoionization effect is taken into account. TLCDM provides a more successful
alternative to LWDM on subgalactic scales with the added attraction that it
relies on only a minor, natural adjustment to the standard framework of CDM.
