Well, two of those sets did not sprout at all, but the third did. And good thing it was just one set of zucchini seeds, because that one plant is crazy huge. It easily has a spread of at least five feet, with huge pointy leaves, easily overshadowing the nearby peppers and tomatoes.
While the cool summer hasn't been particularly kind to other crops, it doesn't seem to have hurt the zucchini at all, and we are now starting to harvest its goodness.
So not only is the plant itself ridiculously huge, so are zucchini! We've never harvested anything that looked like it could be used as a weapon.
Foodgoat used one to make breaded zucchini, which was delicious and a surprising hit with GoatSpawn.