I worked a lot on this some time ago, but there is renewed interest in parts of the mathematical physics community, and I am picking it up again. This is a way to describe supersymmetry multiplets as cohomology of a BRST operator Q=\lambda^\alpha D_\alpha, where D is a superspace covariant derivative. It works for any supermultiplet, but the maybe most interesting thing is that it provides supersymmetric BV actions even for maximally supersymmetric models, e.g. D=10 SYM and D=11 SG, and I can for example sketch how this works.
