You can use these fresh tips. I love Craigslist!
1. Do not post the same subject line twice.
2. Post your ads on the major cities. They have the most traffic.
(Seattle, S.F. Bay, Washington D.C. and New York)
3. If posting an image ad, change the path to that image
every 3-4 days. I mean you can duplicate your image and modify
the name of the new one. It will seem a new different image.
4. Post only in categories that directly relate to your product or service.
Hope it helps!