Back in my catholic days, I did readings at mass. That was pretty cool. Last time I spoke publicly, was a radio interview back when I was in college. What made me nervous was not talking to the mike, but making sure I didn't say the wrong thing. Live, no script! I was really trying to avoid "umm" and "like".
I also had a job in a bowling center during the Bowling for Dollars league. Not really a league... but the manager there would do a running commentary during one game, and the other desk guy would do it during the second game. I would do it during the last game. There was quite a few people doing this, it was rather popular at the time. That went off pretty good. In fact, thanks to CFC I wouldn't mind doing it again so I can rant and rave about whatever....okay, that job would last a day...
Never been really itimidated by it, but on the other hand it's something I'd rather not do.