You could start by checking out some dating sites - all shown have transsexual contacts as well:
Dragoncastle
Contact forum with many Asian trans-girls
http://www.dragoncastle.net
Face-Pic
Contact forum
http://www.face-pic.com
Gayromeo
Contact forum
http://www.gayromeo.com
Guys4Men
Contact forum primarily for gays but with TG also
http://www.guys4men.com
MeetLadyboy
Contact forum for TG
http://www.meetladyboy.com
TG Solena's Yahoo group for match-making
A group about parties in NYC - US based
http://groups.yahoo.com/group/solena_chaniago/
TGpersonals
Contact forum for TG
http://www.tgpersonals.com
Urnotalone
Contact forum for TG
http://www.urnotalone.com