http://classifieds.myspace.com
http://classifieds.yahoo.com/
http://epage.com/
http://expo.live.com/
http://free-advertising-blog.com/index.php
http://postaroo.com/
http://www.1americamall.com/
http://www.adlandpro.com/
http://www.adlot.net/
http://www.adpost.com/
http://www.adquest3d.com/
http://www.backpage.com
http://www.bestmall.com/l
http://www.chooseyouritem.com/
http://www.classified2000.net/
http://www.ClassifiedAds.com
http://www.classifiedsforfree.com/
http://www.craigslist.org/
http://www.domesticsale.com/
http://www.effectlocal.com/
http://www.FreeAdvertisingForum.com
http://www.highlandclassifieds.com/
http://www.homeworkads.com/
http://www.InetGiant.com
http://www.interking.com/
http://www.mocca.com/
http://www.oodle.com/
http://www.pressmania.com/
http://www.recycler.com/
http://www.sell.com/
http://www.theadnet.com/
http://www.TheFlyer.com
http://www.usfreeads.com/
http://www.wikalo.com/
https://www.google.com/base/

Know of any others?  Leave a comment!