I'd tend to agree pretty much with tlover ....
I'm uncomfortable with "Ladyboy" or "Shemale" as I also associate these terms with the porn industry ..
On the other hand, I've often heard T-Girls refer to one another as "Trannies" .. in the same way as I've heard Male Homosexuals refer to each other as "Queens", "Queers" or even "Poofs" ...
In my experience "T-Girl" seems fairly acceptable .. as does "Trans Woman or Women" ..