  New results are presented for Ps(1s) scattering by H(1s), He(1$^1$S) and
Li(2s). Calculations have been performed in a coupled state framework, usually
employing pseudostates, and allowing for excitation of both the Ps and the
atom. In the Ps(1s)-H(1s) calculations the H$^-$ formation channel has also
been included using a highly accurate H$^-$ wave function. Resonances resulting
from unstable states in which the positron orbits H$^-$ have been calculated
and analysed. The new Ps(1s)-He(1$^1$S) calculations still fail to resolve
existing discrepancies between theory and experiment at very low energies. The
possible importance of the Ps$^-$ formation channel in all three collision
systems is discussed.
