American Chamber of Commerce in the Czech Republic
Czech Center New York - associated with the Czech Ministry of Foreign Affairs to promote the Czech Republic abroad; list of events held at the Center, doing business in the US, travel information, Czech organizations in the US, resources, and more
Czech.cz - an excellent site by the Czech Ministry of Foreign Affairs; lots of information on Czech Republic travel, business, leisure, study, work, and more
Czech Embassy in Washington
Czech Statistical Office
Ministry of Foreign Affairs of the Czech Republic
Relocating.cz - Czech Republic relocation services; visas, work permits, company and vehicle registrations, accounting & tax advisory, home finding, etc.