What can I substitute for 1 cup of butter in baking recipes (e.g. cookies, muffins, cakes, etc.)?
I'm looking for something that has less saturated fat (and also doesn't have trans fat).
Update: Since baking is less forgiving than cooking (i.e. if you don't use the exact amount of each ingredient the recipe might fail), could you please also include the amount you would need to use to replace 1 cup of butter?