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I haven't been to Argentina, save for a few hours over the border from Brazil at Iguazu.

Other People's trip reports
Argentina 2009-10: Trevor Hardaker, 2 weeks & 14 species including Patagonian Mara (click on the "my trips" link on the right hand side and then choose Argentina).

North West Argentina 2009: Richard Webb, 2 weeks & 18 mammals or so, including Jaguarundi and 2 species of Tuco-tucos.

Argentina, 2005: Steve Anyon-Smith, 4 weeks & 18 mammals.

Around the World (Chile and Argentina), 2004: Richard Webb, 4 weeks & 18 species.