Ciao Chrissy,
What Carol Deppe, the bigtime
plant breeder advocates if you want to do your own squash pollination for
seed-saving practices or if you want to purposely cross your squash into something different, is to masking tape them closed the night before they're about to open (you'll need to do a bit of
plant micro-management to figure this out) and then in the morning, first thing, untape them and do as John says, take the petals off the male
flower and use it as a pollen applicator. It should have yellow fluffy-looking pollen clinging to the anther. Brush the pollen from the male anther onto the female stigma. Then tape the female
flower closed again. She says bees will sometimes bite into taped
flowers so check for holes in the taped
flowers and don't use the fruit for
seed-saving if you see holes. Be sure to tag the female
flower for future reference so you'll know which fruit to save for
seed.
I got Carol Deppe's book "Breed Your Own Vegetable Varieties" for my birthday. John, you should get this book if you don't already have it.
Cheers,
Julianna
Wow, never heard that one before. They musta stopped to take a nap. 
