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GameFAQs
http://www.gamefaqs.com/portable/ds/data/925581.html
Contains information and a message board.
GameSpy DS
http://gba.gamespy.com/nintendo-ds/harvest-moon/
Information, news, and screenshots.
IGN DS
http://ds.ign.com/articles/563/563218p1.html
Preview, by Anoop Gantayat: "The version of the game on display looked pretty far along visually."