Well, at least your dad took it reasonably well. I mean, I could easily imagine some people totally freak out and start shouting, throwing things etc. Based on his reaction, I don't think you'll have huge trouble coming out to your parents. But, I agree with Becca and Alyssa M.: This is your transition, keep all aspects of it under your control. You may end up being in a very uncomfortable position if you still live with your parents and they find out about it before you're ready to come out. And I'm not suggesting that you should come out to them now, or any time in the near future for that matter. Do it when you are ready. I'm just saying that don't let anyone or anything hijack yor coming-out schedule.
But then again, who am I to give you advice? It's only a matter of time before something like this happens to me...
BTW, Sarah, I'll reply to your PM, well, probably in the next 48 hours or so. I've been too tired to do much of anything exept the things I have to: School, trying to apper totally normal to my parents despite of the obvious depression which I can't do anything about, etc. I've been sooo tired lately...