For the actual links to these sites, just visit the Ranked List.
Alexa Traffic Rankings As Of May 27, 2008:
Alexa Traffic Rank: 1 Yahoo Classifieds
Alexa Traffic Rank: 2 Google Base
Alexa Traffic Rank: 4 Windows Live Expo
Alexa Traffic Rank: 6 Myspace Classifieds
Alexa Traffic Rank: 940 (UK) Gumtree
Alexa Traffic Rank: 1,940 Backpage
Alexa Traffic Rank: 3,543 Kijiji
Alexa Traffic Rank: 5,453 US
Alexa Traffic Rankings As Of May 27, 2008:
Alexa Traffic Rank: 1 Yahoo Classifieds
Alexa Traffic Rank: 2 Google Base
Alexa Traffic Rank: 4 Windows Live Expo
Alexa Traffic Rank: 6 Myspace Classifieds
Alexa Traffic Rank: 940 (UK) Gumtree
Alexa Traffic Rank: 1,940 Backpage
Alexa Traffic Rank: 3,543 Kijiji
Alexa Traffic Rank: 5,453 US