If you get nervous or feel intimidated when you have to speak at a meeting or in front of more than just one other person, try Toastmasters. It's an inexpensive way to get better at speaking - both in and out of the workplace. Toastmasters starts you with a basic manual and you grow from there. It's a great way to take control of the greatest fear most people have (yes, they would rather die than speak in public).
Find a club in your area: www.toastmasters.org/