  Design studies for a Super Flavor Factory (SFF), an asymmetric energy e+e-
collider utilizing International Linear Collider (ILC) techniques and
technology, are in progress. The capablity to run at center-of-mass energies
near 3.770 GeV could be included in the initial design. This report discusses
the physics that can be probed with luminosity of 10^{35} 1/cm^2 1/s near
tau-charm threshold.
