Here are some tips for your own garage sale:
Fixed Price Boxes: instead of pricing a ton of individual things, make a couple of boxes. One can be $1 items and another $0.50 items. The boxes should be shallow so everything can be seen.
High Saturday, Low Sunday: begin Saturday with fairly aggressive pricing. Within a few hours, start dropping your "rock bottom" prices. Unless this is a regular thing, you probably want to get rid of stuff just as much as you want to make money, so getting $0.25 for a picture frame is better than asking $2 for it and throwing it away when the sale is over.
Start Early: this is something that we will not do. We work late nights and are not morning people. If we can get 50% of the things out by 8:00, we're in good shape. If you can stand it, try and be ready to go at 7:30.
Craigslist: this is an easy one. They let you put garage sale ads up for free! We put an ad up yesterday and have already received 5 emails about various items we had listed. It's better than putting it in the newspaper and doesn't cost anything!
Easy to Read Signs: they should be clear, clutter free and easy to read. Clean arrows, precise directions and LARGE writing are key. People really take signs seriously. I mean, if you only had 5 minutes to spare, and you drove past a small, messy sign and past a clean, easy to read one, which sale are you gonna go to?
$0.50 Sodas: why not? Especially if you already have them in the fridge!
Bags: make sure to have bags ready for people to either shop with or to put their stuff in to take home. You know how hard it is to juggle a vase, coffee maker and a shirt while trying to examine a lamp. Don't discourage people who want to buy a lot of stuff!
How to Deal with Lowball Prices: get their phone number, call them on Sunday if the item has not moved. We did this last year with a TV. We were asking $50, someone offered $25 on Saturday at noon. We couldn't do it, but said we'd call them if it was still there Sunday afternoon. It was, and we made the sale. We were both happy as clams!
Have Fun! It's the weekend and you're making money sitting in your front yard, that's awesome!