I wouldn't say the hubby and I are the tightest wads, but we do try to be frugal when we can.
I recall a quote that goes something like "Use it up, wear it out, make it do or do without." That's pretty much my motto....
For example:
The hubby and I plan our dinners every week and then only buy the food for those meals during our weekly trip to the grocery store. Occasionally we'll splurge (the hubby has to have his desserts), but the list definitely helps us in not wasting food.
We order the Sunday paper so that we get the weekly coupons. The savings that come from coupons every week more than pays for the paper.
I eat lunch at home (work from home) and make the hubby's lunch (most days). If the sandwich bags aren't beyond repair we'll reuse them.
We reuse the plastic grocery bags as trash bags in our garbage cans.
We try to turn the lights off when not needed.
We turn the heat off at night. On the really cold nights we use a space heater in our room and keep that at 65. We keep the heat low and use blankets or bundle up when home and turn it off when not home. We'll use a fan in a single room rather than air condition the whole place if we can help it.
We buy store brands when we can or whatever's the better deal.
We take advantage of Sam's whenever we can.
We walk whenever we can rather than drive. When we have to drive places we'll try to maximize our drive time by getting many things done at once if they are in the same area, or plan a route so that we minimize our driving.
We search for deals on craigslist and other local listservs. The two couches we have right now were free from people looking to get rid of them. The majority of our other furniture and some of our kitchenware was either free or really cheap.
We shop at IKEA.
We take advantage of giftcards or online deals.
Etc, etc, etc.
I think you get the idea.
EDIT: We use store brands assuming they don't contain extra junk that the name brand does not...like hydrogenated oils and high fructose corn syrup.