Originally Posted by raymor

Hotelbookers.com or hotelclub.com would be merely descriptive and therefore not protected.

hotwire.com is protected because neither hot nor wire describe hotel booking. The word "club" wouldn't be protected as a brand of travel discount club, or any other discount club. The exact same word, "club", IS protected as a brand of cracker (by Keebler). It can be protected for crackers because "club" is otherwise unrelated to crackers.