The Absurdly Optimized Pancake: Leavening Chemistry, Acid-Base Stoichiometry, and an Interactive Calculator
(www.absurdlyoptimized.com)
You should get one. I was late to the party, but it's made a huge difference convenience-wise. Instead of dealing with (and washing) various measuring cups, I just pour directly into the mixing bowl and zero it out after each ingredient. I think a cheap one only set me back a little under $20.