  We present measurements of the component masses in 15 Cataclysmic Variables
(CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations
of the relationship between superhump period excess and mass ratio, and use
this relation to estimate donor star masses for 225 superhumping CVs. With an
increased sample of donor masses we revisit the implications for CV evolution.
We confirm the high mass of white dwarfs in CVs, but find no trend in white
dwarf mass with orbital period. We argue for a revision in the location of the
orbital period minimum of CVs to $79.6 \pm 0.2$ min, significantly shorter than
previous estimates. We find that CV donors below the gap have an intrinsic
scatter of only 0.005 R$_{\odot}$ around a common evolutionary track, implying
a correspondingly small variation in angular momentum loss rates. In contrast
to prior studies, we find that standard CV evolutionary tracks - without
additional angular momentum loss - are a reasonable fit to the donor masses
just below the period gap, but that they do not reproduce the observed period
minimum, or fit the donor radii below 0.1 M$_{\odot}$.
