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[Cadfan]

Ticket to Ride
Carcassonne: Hunter's and Gatherers
Lascaux
Zooloretto
Cash & Guns

Depends a lot on the person. I've started some people right away on Agricola and had success. I knew they were geeks, so they wouldn't be turned off by a long game, and its so thematic that its easy on new players. And it really creates that "Oh, I REALLY should have done THAT!" feeling that makes people want to play again.