ESite Marketing
http://www.esitemarketing.com
"...provides incomparable expertise, customer service and essential e-solutions and strategies to the hospitality industry, "

Hotel Electronic Distribution Network Association
http://www.hedna.org/
HEDDNA's activities are intended to stimulate hotel bookings through the use of Global Distribution Systems (GDSs) as well as other electronic hotel reservation methods. Site includes a catalog of their research publications.

Hotelmarketing.com
http://www.hotelmarketing.com/
Online magazine for hotel marketers, hoteliers and online travel marketers. Updated daily, the site includes industry news; daily e-mail newsletter; and business information in the categories "Internet Marketing", "Online Travel" and "Hospitality Industry."

TravelClick
http://www.travelclick.net
"Provides hotels with the right tools to drive success in the world of electronic distribution and marketing."