I like the idea of weighing your ingredients, but how much does 2 cups of flour weigh?

EllenBakes is correct, there are also a ton of conversion sites on the web that will do the math for you.

The simplest way to determine the weight of flour is to actually weigh a cup's worth of flour on your own kitchen scale (digital most accurate). Also, do you want the weight in grams or ounces? A good digital kitchen scale should have both measurement types. You can find plenty of articles online about weighing flour but About.com (http://busycooks.about.com/od/howtobake/a/measureflour.htm) has a good one on the subject.

Happy weighing!