I just planted several varieties of squash, some bush-style (zucchini) and some vine-style (spaghetti squash, potimarron). Looking around the internets, the advice is almost universally to plant three seeds in one mound of compost or whatever you're growing them in. What's unclear and inconsistent, though, is whether you should then thin them out so you only keep the one best seedling of the trio, or leave all three in place.
My instinct is to thin the bush-style squashes, but not the vine-style ones. Does anyone have any more knowledgeable advice?