Hotels and Resorts 
Hotel chains and online reservations services for them.
1. All Wonder
Provides the unique collection of the site owners' picks for the "World's Best Hotels". Each listing includes a brief history, dining and conference facilities, and recreation & sightseeing opportunities.
http://www.allwonder.com/
2. Best Western 
Worldwide hotel chain. Online reservations, electronic hotel guide, meeting planners, specialty traveler information, and new hotels highlight.
http://www.bestwestern.com/
Reservations for hotels worldwide, including Argentina, Brasil, México, Chile, Uruguay, USA, and other countries. Mostly in Spanish with some English.
Reserva de hoteles online.
Reserva de hoteles online.
http://www.clickhoteles.com/
Reviews and ratings covering over a large number of hotels around the world.
http://www.globalhotelreview.com/
5. Go Hotels
International hotel directory with online booking system. Search by city, state/province, country, hotel name, check in date, and length of stay.
http://www.gohotels.com/
6. Horse XXI 
On-line hotel reservation system with worldwide hotel catalog, reviews, and pictures.
http://www.horse21.net/
Searchable list of hotels worldwide, includes brief introductions to popular destinations. Provides heavily discounted rates.
http://www.hotelalliances.com/
Online reservation system for hotels worldwide. Search by check-in date, check-out date, destination, and number of people travelling.
http://www.xcapewithus.com/