Oh yeah, what about the whey...is it useful for anything?
Yup. I make my salad dressings from it, replacing vinegar and most lemon juice. Also cold soups can be made with it, like Gazpacho and others.
Make crackers/mazza/tortilla types of unleavened bread.
Use it instead of water in your leavened bread.
If the whey is very white you may be able to make Ricotta with it. Although Ques Blanco is supposed to have a very high yield so it is unlikely.
If you search the forum you'll get a lot more ideas, as I've seen it discussed before.