Use grocery store bags to line trash cans. This may not work if you use a big trash can, but we use a small sized one for which the grocery bags are a perfect fit. This helps me save some money.
Use less laundry soap. Instead of filling the cup to full or overflowing, just add 1/2 the amount. The clothes get just as clean and the bottle lasts longer.
Eat at home more often. Life is busy nowdays, and if both hubby and wife are working, it can seem overwhelming to prepare and cook food at home. Start small and work from there. Invest in a crockpot; it'll literally pay for itself in no time at all. And the benefit of a nice, hot, home-cooked meal that is ready to eat when you get home is priceless!
Bottle your own water. This seems like a no-brainer, but you'd be surprised at how many people buy into that "bottled is better" theory. If you don't like the taste of your tap water, invest in a filter for your faucet. In the long run, you'll save $$!
Do you have any tips to add to this list? Let me know!! :)