It doesn't seem that there's a great deal that most of us can do, in support of this strike (I could drive to L.A., and refuse to cross the picket line--but then, if I crossed, I'd be turned away by security right beyond the picket lines...). That's frustrating to me, since I generally support the ideals of unionism and my impulse is that there must be something I can boycott (TV? I already don't watch broadcast and cable; what I see on our set is DVDs--which only makes the WGA's point).
So here's something you can do. Sign a petition.