Exodus International was formed in the 70s, and one of the co-founders was Michael Bussee. At that time they claimed that change was possible - that you could actually change from unwanted same-sex desires to ...something close to heterosexual. The history of Exodus is fraught with re-defining their claims and expectations, and fuel has been added by many who really, really wish that someone, anyone really could change.
Michael Bussee is no longer affiliated with Exodus International, and he has made sincere apology for the harm he caused by promoting the hope and false possibility of change. Most recently, he has made several very calm and honest videos. Thanks to youtube.com, we can see ALL of these videos and become educated. It's better to hear "from the horse's mouth" than to listen to those who merely make theological claims.
Here is the link for the series of six videos. http://www.youtube.com/user/exodusinternational (Thanks to Daniel Gonzales and http://www.boxturtlebulletin.com for making these and posting them. I'm tremendously fond of those boxturtle guys and all they do to bring us pertinent information and news.)