  We study six pedal-like curves associated with the ellipse which are
area-invariant for pedal points lying on one of two shapes: (i) a circle
concentric with the ellipse, or (ii) the ellipse boundary itself. Case (i) is a
corollary to properties of the Curvature Centroid (Kr\"ummungs-Schwerpunkt) of
a curve, proved by Steiner in 1825. For case (ii) we prove area invariance
algebraically. Explicit expressions for all invariant areas are also provided.
