It never hurts to have a Gold status with Accor just in case you happen to find a great price at one of their hotels or to be in a place where you don’t have your favorite chain represented. Accor has pretty good coverage in South America, Europe, and in part of Asia.
Last year they run a promotion for instant Platinum status. Right now they have a promotion that gives you an instant Gold status with Accor’s A Club. All you need to do is to plug in the promotional code ACLUBFROHMYGOLD2011 when you sign up.