The lattice Schwinger model with the SW action
  We perform a model study on the 2-flavor lattice Schwinger model using standard Wilson and ${\cal O}(a)$ improved Sheikholeslami-Wohlert (SW) action. We find, that the phase diagram is altered, the critical line shifted closer towards its continuum value $\kappa_c=0.25$. We find no improvement in the rotation invariance of meson propagators; the scaling of the Schwinger mass is considerably improved, high momentum states are not. The additional cost of $\approx 30 %$ CPU-time is highly justified when calculating masses, but not for high momentum observables. 
Ch. Hoelbling (Boston Univ.), C. B. Lang and R. Teppner (Univ. Graz,   Austria)