Teaching and presenting topics to groups are skills most librarians gain while on the job. There are resources for help with public speaking and presentations. Some of the free resources are:

Presentations: Technology and techniques for effective communication (magazine, http://www.presentations.com ). Be sure to check out this magazine and site when it is time to purchase a new projector or microphone for your training room.

Located on their website is a list of presentation-related associations: http://www.presentations.com/presentations/business_resources/industry_links.jsp

Another great resource is the one hosted by Website Estates. Tutorials, how-to articles on presentation topics, and free PowerPoint templates are available on this site: http://www.websiteestates.com/ .