Eco Travel
Online ecotourism directory and magazine.
http://www.ecotravel.com/

InfoHub
Comprehensive online directory of special interest tours.
http://www.infohub.com/travel.html

Smoke Free World
Your guide to smoke-free dining, entertainment and travel around the world.
http://www.smokefreeworld.com/

Specialty Travel Index
Searchable index of tour operators worldwide who specialize in adventure or special interest travel.
http://spectrav.com/

Travel Quest
Worldwide directory of special interest, activity and adventure holidays and tours.
http://www.travel-quest.co.uk/

Vegetarian Vacations
Features lodgings, holidays and tours for vegetarians worldwide.
http://www.vegetarian-vacations.com/