I'm in the process of coming out at work, All of Management have been extremely supportive and positive, I feel I work at in a great place where most everyone will be very accepting.
A big part of my transition is who to tell and when and what to tell them. One thing I've been thinking about is
if I should include a personal note talking about what this means to me, and why I'm Transitioning now and links for people to learn more about Transgender issues. I've been told I don't Need to do this, that people only need to know that I've Transitioned the company fully supports this and I should be treat as a new employee, But I can tell people whatever I want.
I'm afraid the process can seem a little impersonal and possibly unrealistic, people will naturally have questions about me and about Transitioning and I'd rather they have the right answers from me then make things up.
How personal should I be in an open email, and should I include information or links so that people can learn more? Or is it better to just talk to people who express an interest?

The wiki contains a very useful article on coming out at work. It's still a long way for me but I read it anyway because it's one of my biggest concerns, and now I have a much clearer view on how to tackle it when the day comes.

In short: don't send any email—contact HR and let them take care.

I'm just pulling people aside one by one. I started with sympathetic, discreet people to lay a groundwork, but my goal right now is to tell the biggest gossips at work.

And, you know, theoretically HR is supposed to enforce that fancy non-discrimination language.