  We summarize a series of papers reporting studies of the ellipticities of
X-ray images of five Abell clusters and two early type galaxies to learn about
the shape of the gravitational potential and the underlying matter
distributions. For the clusters we find the dark matter is centrally
concentrated with ellipticity $\epsilon_{DM} \sim 0.5$. For the galaxies we
find independent evidence for extended, flattened dark matter halos. One case
of a clear isophotal twist in the X-rays may indicate a triaxial halo.
