HF3011 .E9 2008/09 Ref
A bit dated, but provides excellent detailed information for U.S. exporters arranged by country. Contains country profile, communications, key contacts, trade regulations, documentation, marketing data, transportation, and business travel information.
Excellent resource for international business information created by Michigan State University. Great place to start.
U.S. Government Export Portal
Excellent market research information including Country Commercial Guides, Industry Sector Analysis Reports, and International Market Insight Reports. Free registration required to access portions of the site.