There are some very helpful places out here in cyberspace, when you or someone you know is questioning their gender identity.
There are also some places inhabited by opinionated and argumentative people.
And sometimes you will find both in the same place.
Here are links to places that I have found useful or interesting, with brief descriptions.
Nuttycats a support forum for transsexual people, their partners and family. I’ve been a member for a long time, and found it a good place. You need to apply to join.
Rose’s Forum caters for a wider area of the transgender spectrum
UK Angels again, a site catering to the transgender community
My Husband Betty (mHB) an American forum; transgender, with a strong element of support for, and contributions from, partners. This is important, in an area of cyberspace where there are groups for trans people, but few resources for partners who may be feeling left out of the loop.