I like this thread! Thanks OP for starting it.
In addition to the wonderful suggestions above, may I add:
1. Use your library: get books, videos, dvds, read the paper all for free! Plus it's a great place to cool off on a hot summer day!
2. Combine sales a coupons and see what you can get free or close to it.
3. Eat seasonally to save money.
4. Stretch your meals with rice, pasta, bread, fruit, etc. and use less meat.
5. Trade child care with a friend.
6. Learn ingredient substitutions in your kitchen.
7. Make sun tea.
8. Put up extra produce when it is in season.
9. Check those reduced price racks for bargains.
10. If you have kids, always keep some snacks in the car to ward of those hunger pains so you can wait to get home to feed them a real meal.
11. Keep water bottles in the car also.
12. Wash your laundry in cold water.
13. Take advantage of free concerts and other free events.
14. Go yardsaling for fun and get some much needed or wanted items. I keep a running list of what I am looking for.
15. Email people instead of calling or using snail mail. Much cheaper!
16. Get together with friends for a potluck and game night or picnic and ball game! Lots of fun!
17. Set up a tent in your yard and let the kids "camp out".
18. Do big batches of breads, cookies, lasagna, soups, stews, etc. and freeze some for use later.
19. Make your own yogurt, breads, cookies, spice mixes, etc.
20. Use less detergent than the soap manufactureres call for.
21. During the summer, have your kids shower at the pool before they come home after swimming. One less shower at your house!
22. Water your garden either early in the morning or in the evening to keep the sun from evaporating all that water away so quickly.
23. Plant a garden. Even if it's in pots, you can have salad through the summer this way.
24. Compare prices and shop around! We saved $200 on our oven this way.
25. Think of ways to reuse items. We wash out our ziplock bags by turning them inside out and running them through the hot water wash in the washing machine and then hanging them to dry.
26. Conserve energy in your home.
27. Make time to laugh and have fun with your family!
28. Get rid of some of your magazine subscriptions. You can find lots of free subscriptions online.
29. Take advantage of internet coupons and deals!!!
30. Shop thrift stores, yard sales and auctions for things. We've got some beautiful antique furniture and dishes this way along with clothing, books, garden tools, kitchen appliances, videos, etc.
31. Be thankful for all that God has blessed you with!!!!