We've had numerous discussion of "trans-this" versus "trans-that" on this site, but the issue of Nathalie's post was why we don't refer to ourselves more as "transgender" rather than "crossdresser". I think the reason is the general confusion in the public's mind about these terms. Witness the national attention given to children who are raised in the gender they identify with, rather than their birth gender. They are almost always refered to as "transgendered" rather than "transsexual" -- so the public perception is that "transgendered" implies wanting to be full-time in the opposite gender. Obviously that does not apply to many of us, which may explain our reluctance to use the term.
Me, I happily embrace both TG and CD!