I've given a number of talks in my life, to a variety of audiences. In so doing, I've used a variety of different technologies: overheads with transparencies, chalkboards, PowerPoint, whiteboards, and even one last year using Elluminate. But they've always been talks - generally, one-way communication.
Right now, though, what excites me and is causing me to lose sleep at the same time is that I am leading a conversation at EduCon 2.5 on Saturday. The topic that I proposed was "A New Vision For Mathematics In High Schools" - in hindsight, I think I would have ratcheted that title down a bit, but there you are. I'm excited because this is an opportunity for me to learn from some amazing educators, both during my session with them and in the multitude of other sessions on offer on Saturday and Sunday. For my own session, I am desperately curious to know whether there are ways, both realistic and perhaps pie-in-the-sky, to restructure the math curriculum; whether or not there are new roles that mathematics teachers can play in schools; and whether or not there is any interest in changing the role of mathematics itself within the high school educational setting. I am losing sleep over this for the simple reason that I've never done anything like this before and have absolutely no idea how it will be.
There is more information about the conversation at my wiki, which I hope will be a document that evolves during Saturday's discussion. I am looking forward to this more than any professional development opportunity I've been a part of before, and I'll report back to let you all know how it went!