Trade 1, no. Zimmermann's a man. Strasburg is a man, too, but that's too much to give up.
Trade 2, no. D. Price is a buy-low candidate right now, and Granderson is, well, Granderson. More valuable than Price at this point.
Trade 3, maybe. If you are in need of a SS and not CF, Desmond is solid. I might actually do that deal.
Trade 4, I'm not so sure. I like Jennings a lot for some reason. He gets on base, swipes bags, has pop. Crawford is hot right now, but who knows if he keeps it up. Andrus is great if you need a SS who can steal bags, and I'm not very confident in CJ. Walking too many guys right now. I don't think I'd do this deal. You could probably get similar production out of a guy like Andrus for a lower price.