There are a million and one posts out there about the wonders of vinegar, so I thought I'd throw in my two cents. Here are four ways I personally have used it:
1) Mould inhibitor: I make homemade bread, which has no preservatives. I keep the bread wrapped in a paper towel in a Tupperware tub in my fridge, and between each loaf I wipe out the container with Vinegar. I have yet to see any spoilage using this procedure.
2) Spray cleaner: This one is good for the kids: I can clean the walls with the kids in tow, and not worry about them breathing in vapours or fumes.
3) Cleaning coffee maker: An oldie but a goodie - enough said.
4) Deodorizing cat pee: Just pour on full strength, and it takes care of the stinkies. I`m not sure how. Your house smells like a french fry stand for a day or two, but once that smells fades, the cat pee doesn`t return, unlike with most commercial sprays.
I buy vinegar in bulk from Costco and always have lots on hand. It`s definitely useful stuff!