  We report preliminary results of a project to homogeneously measure star
formation histories for the majority of Local Group dwarf galaxies, based on
archival WFPC2 observations. For the dwarf spheroidal and elliptical galaxies,
we find that the more luminous systems all show extended star formation
episodes, while the less luminous systems typically formed most of their stars
over ten Gyr ago. Irregular galaxies show no comparable trend. We find that a
galaxy's classification as an irregular or spheroidal is entirely explained by
its star formation within the past Gyr or less. Several elliptical/spheroidal
systems actively formed stars within the past two Gyr, and would have been
indistinguishable from present-day irregulars if observed two Gyr ago.
