  The basic physics of quantum-correlated D0, D0bar pairs produced at threshold
via decays of the $\psi(3770)$ is introduced. The connection to extractions of
the CKM angle $\gamma$ ($\phi_3$) from $B$ decays is emphasized throughout.
Recent quantum correlation results from BESIII and CLEO-c are then summarized
before closing with a discussion of selected issues.
