Not all of them can be considered transsexuals, in that they want to change their sex. In fact many of them live seemingly normal lives as heterosexual men with female partners. Many are married with kids.
I have put up a blog for autogynephiliacs and others interested in transgender issues over at Confessions of an Autogynephiliac (now called Crossdreamers).
That blog also contains links to other sites covering the topic of autogynephilia.