  We present new, high sensitivity VLA observations of HI in four dwarf
galaxies (UGCA 292, GR8, DDO 210, and DDO 216) and we use these data to study
interactions between star formation and the interstellar medium. HI velocity
dispersions and line shapes in UGCA 292, GR8, and DDO 210 show that these three
galaxies contain both warm and cool or cold HI phases. The presence of the cold
neutral medium is indicated by a low-dispersion (3--6 km/s) HI component or by
the Gauss-Hermite shape parameter h_4 > 0. Contrary to expectations, we find no
trend between the incidence of the low-dispersion (colder) phase and the star
formation rate in five dwarf galaxies. The colder HI phase may be a necessary
ingredient for star formation, but it is clearly not sufficient. However, there
is a global trend between the star formation rate of a galaxy and the incidence
of asymmetric HI profiles. This trend probably reflects kinetic energy input
from young massive stars. Numerical simulations show that the effects of
rotational broadening (finite angular resolution) are minimal for these
galaxies. Simulations are also used to estimate the errors in the column
densities of the high-dispersion and the low-dispersion HI phases.
