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I haven't been to Sulawesi yet but I intend to.

Other People's trip reports
North Sulawesi and Gorantola 2009: Jean Dille, 10 days and some nice mammals including Spectral Tarsier, Anoa, Bear Cuscus, Heck's Macaques and Babirusa.

Indonesia (esp. Sulawesi) 2009: Steve Anyon-Smith, 1 month & 20 mammals including Sulawesi Tarsier and Bear Cuscus.

Sulawesi 2009: Curtis Hart, 3 weeks and 11 mammals including Babirusa, Bear Cuscus, Togean and Heck's Macaques and Spectral Tarsier.

Sulawesi 2008: Ignacio Yufera, 3 weeks and 6 mammals including Babirusa, Bear Cuscus and Spectral Tarsier, with some great pictures.