Haven't had time to read the whole thread yet but here are some things I do:
Don't use dryer sheets at all, use the dry sensor on the dryer and use vinegar in the wash in place of fabric softener...or hang dry clothes instead.
Cloth diaper and cloth wipes.
Use cloth napkins, kitchen towels and washcloths instead of paper products.
Limit use of disposable items.
mix beans in with ground beef for tacos, etc...still get protein but its much cheaper
cut the amount of meat you serve at a meal in half, no one needs large portions of meat.
vinegar for cleaning the table top and counter, its a great disinfectant and healthier than those clorox or lysol wipes
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eat all your leftovers
make things instead of buying (including things for kids to play with, clothing and towels/napkins (if you can sew), etc)
cut up old stained clothes and use as rags for those messy jobs you'd use paper towels for instead
make your own yogurt or ricotta cheese in the crockpot (super easy)
can your own fruits, vegs and jams
secondhand stores for clothes and toys. I don't think my kids have very much stuff that was brand new prior to them getting it...shop yard sales