You can order brochures from 150 leading tour operators - and trust that you have an understanding postman. This site tells you not where to go but when. If it's happening on the planet, then whatsonwhen can probably give you the dates and some deep background. Its 21 themes include everything from the bizarre, such as this week's Skin Disease Show in Bordeaux, to the more prosaic sport, film, clubs and parties. Essentially a portal for a large number of special interest tour operators, it is also strong on corporate hospitality, with luxury packages to major sporting events.
Payment is on credit card via fax or email.
All pricing is in American dollars although that could change when the Canadian company opens its London office this autumn. On my last visit, there were nearly 600 Italian and 300 French courses available for online booking. This site lists adventure tours. With 36 adventure pursuits in 200 countries, it must be the most comprehensive adventure directory on the web. Sometimes you may even receive them.