Hints for a great yard sale:
Wait until you have plenty of stuff OR combine efforts with a couple friends. People won't stop if you have just a few things.
Toss out the garbage. If people see a few good things amongst a bunch of junk, they'll leave.
Price everything -- people don't like to ask "how much is this?" If you have oodles of kids' clothing, consider a big sign that says "All kids' clothing in this box .50"
If your sale is just before a Disney trip, consider letting the kids have their own toy table. When Disney souvenier money is on the line, they're more likely to be willing to part with outgrown toys. (Just last week my 6-year old caught me bagging up some old toys, and she declared long and loud that she still LOVED that old wind-up baby radio and that she plays with it DAILY -- this is blatantly false.)
Selling food can be a money maker, but consider using canned drinks and packaged food (pop tarts, Little Debbie cakes). I personally will not buy homemade food from someone's front yard. Additional benefit: canned drinks will save, so you can confidently buy plenty.
A yard sale has two purposes: to raise money AND to clean out your house. Price things low so they'll move.
Your real yard sale crowd will show up early. Consider putting up an "Everything half price" sign at 10:00. Remember that what you don't sell, YOU have to pack up.
Location is everything. If you live off the beaten path, look for a friend with a better location.
Very important: something that people seem to forget about yard sales . . . you aren't really MAKING money at yard sales. You're recouping a portion of the money you've already spent. It's kind of like a tax refund. The government isn't sending you free money -- they're returning a portion of what you already gave them.
The point: Yard sale items tend to sell for 10 - 25% of their original cost. If you make $1000 at a yard sale, that means that you spent $2500 - 10,000 to buy those items originally.
Sometimes this is inevitable. Your kids NEED jeans; selling them once they're outgrown is a sensible thing to do. BUT if you're buying more jeans (or anything else) than your family actually needs and you're justifying it by saying, "I can sell it at a yard sale," then you're throwing money away. I know that LOTS of people do this because I see brand-new things at yard sales, and I see kids' clothing items that are worn only 1-2 times.
My point again, which I don't think I'm making very well: Instead of recouping pennies on your dollars at a yard sale, sometimes it makes sense to buy less in the first place. If you're able to have a BIG yard sale every year, you might be buying excessive, unnecessary stuff in the first place.
Personally, I had one really big, blow-out yard sale after my children passed the toddler stage. I sold the crib, the high chair, etc. These were things that we had needed and had used for years. Since my daughters' growth has slowed, they're wearing their clothes out, and I don't have much to put out at a yard sale; consequently, we have a sale every three years or so.
). We sold lemonade, cookies and zucchini muffins (zucchini from our garden). We held it on a Saturday. Then we held it again the following Friday and just for fun for that next Saturday for a few hours. We got rid of a lot of stuff (de-cluttered the house) which made DH happy. We agreed to split the money evenly among all 6 of us for spending money for Disney. After reimbursing ourselves for the ad, etc. We each made $27. We're pleased. That's a lot of stuff to sell at 50 cents a piece!!
Thats a very good idea! 
