  We present a preliminary search for D0--anti-D0 mixing using the decays D0
--> K+ pi- pi0, additionally presenting Dalitz-plot distributions and a
measurement of the branching ratio for this mode. A new tagging technique is
used to produce the doubly Cabibbo-suppressed Dalitz plot, which in turn is
used to motivate the method used for the D-mixing search. We analyze 230.4fb-1
of data collected from the BaBar detector at the PEP-II collider. Assuming CP
conservation, we find R_M < 0.054% with 95% confidence, and we estimate that
the data are consistent with no mixing at a 4.5% confidence level. We present
D-mixing results both with and without the assumption of CP conservation.
