Of course it is of superior interest whether the effect can be comfirmed in the new data taken in the 1997 run period. A first bunch of these data have been analysed by both the H1 and the ZEUS collaborations meanwhile. In addition, a lot has been learned about technical issues and systematic effects. Several leptoquark types can be constructed from the weak-isospin multiplets of quarks and leptons, several of them coupling to positrons and quarks and some in addition also to neutrinos and quarks. The latter implies that there also might be an effect in charged current ep scattering.
Supersymmetric models involve a new discrete quantum number called R-parity.
The fixed-target structure function data have small errors and are consistently reported by different experiments, so there is little doubt as to their accuracy. This list will be updated periodically.