WorldTradeLaw.net - Links to Country Tariff Schedules
Selected APEC Country Tariff Schedules (Registration Required. Schedules of Australia, Brunei Darussalam, Canada, Chile, China, Hong Kong, Indonesia, Japan, Korea, Mexico, New Zealand, Peru, the Philippines, Papua New Guinea, Singapore, Taiwan (Chinese Taipei), United States).
Common Market for Eastern and Southern Africa (COMESA) Customs Tariff Database
EC DG Trade Market Access Database (for users in EC Member States only)
U.S. Harmonized Tariff Schedule, from the International Trade Commission