Sprinkle the yeast into a medium bowl containing 1 1/4 cup warm water and stir until yeast dissolves.
Add 2 cups sifted flour and stir until blended.
Add another 1 1/2 to 2 cups flour and blend until too stiff to stir with a spoon.
Turn the dough out onto a floured surface and knead it for 10 to 15 minutes until dough is smooth and elastic. (See "How to Knead Bread Dough" in the Related eHows.)
Place the dough in another bowl greased with a small amount of oil. Turn the dough once so that the top is oiled.
Cover the bowl with plastic wrap and put it in a warm place for about 45 minutes--until the dough rises to about double its original size.
Preheat the oven to 500 degrees F.
Dump the dough back onto the floured surface and punch it down, getting rid of any bubbles. Divide the dough in half and let it rest a few minutes.
Roll each half into a 12-inch circle, depending on your personal preference for how thick pizza crust should be. (It will puff slightly when baked.)
Transfer the dough to an oiled pizza pan or baking sheet, or, if you have a baking stone, to a cornmeal-sprinkled wooden pizza peel for transfer directly to the stone.
Add sauce, cheese and toppings as desired. If you like, brush exposed edges of the crust with olive oil.
Bake each pizza for 15 to 20 minutes, or until crust is nicely browned and cheese is melted.
Read more: How to Make Pizza Dough | eHow.com http://www.ehow.com/how_1686_make-pizza-dough.html#ixzz1DpWaehGv