When we joined the csa I ended up making a LOT of soup and freezing it. (We'd get so many greens in the spring I'd just lightly sautee them and puree with lemon juice, ginger and a little chicken stock... and gulp it down!) Here are a couple of good zucchini soup recipes I found. (I think when I made them I added tofu to protein it up a bit)

Zucchini cilantro soup http://www.epicurious.com/recipes/fo...DER-SOUP-10481

Zucchini basil soup
http://www.epicurious.com/recipes/fo...IL-SOUP-242831

Epicurious, recipezaar, and foodnetwork .coms all are excellent sites.