Pressing the tofu before marinating is crucial. Michelle uses this technique: Place a clean kitchen towel on the counter, and then layer several paper towels on one half of the towel. Place the slices on the paper towels, cover them with a few more paper towels, then fold the other half of the towel on top. Place a cutting board or other flat surface on top, and then add some weight on top (several large cans of food work well). Alternately, you could use a TofuXpress -- it's one of the few "unitaskers" in our kitchen that's actually been a great purchase.