LINKOne of the things that has become a boon for the transgender community was the coming of the internet. I've no empirical data to back up that belief, but the reality that my transgender peers and I can go online and find out about transgender people and issues has allowed community building. Previously, the relatively small number of out transpeople, and lack of interconnectivity between geographically separated transcommunities made it difficult for transpeople to learn of each others' existence.
Not only has the internet provided means for transpeople to interconnect, it's also provided transpeople access to accurate information regarding transgender issues to a wide audience. Examples include TS Roadmap, Psychology of Gender Identity and Transsexualism, the National Center for Transgender Equality, and the Transgender Law Center.