# orbits in tensor representations of GL(V)

I am interested in a description of orbits of the natural $GL(V)$ action on $V^{\otimes d}$. I know this is a classical problem but I tried to find some "good" reference and I couldn't. I'm also interested in orbits of the natural $S_d\times GL(V)$ action on $V^{\otimes d}$. I'm assuming characteristic $0$ but references in finite characteristic are also welcomed.

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Can you say more precisely what motivates your third sentence: "I'm also interested ..."? This seems to get outside the usual literature on Schur-Weyl duality. Are there examples? –  Jim Humphreys Feb 4 '13 at 23:51