Presentation is the practice of showing and explaining the content of a topic to an audience or learner. Presentations come in nearly as many forms as there are life situations. In the business world, there are sales presentations, informational and motivational presentations, first encounters, interviews, briefings, status reports, image-building, and training sessions.
without any tech-tools ... the basics
from the Diane DiResta channel (on public speaking): Fear of Public Speaking One Minute Tips
Diane's series of One Minute Tips will help you move past your fear of speaking in public.
OpenOffice.org, commonly known as OOo or OpenOffice, is an open-source application suite whose main components are for word processing, spreadsheets, presentations, graphics, and databases. See article in Wikipedia
"Impress" is the name given to its presentation programme, whose equivalent is Powerpoint in windows & Keynote in Mac (operating systems). Impress, however, works on any operating system, and is free.
See more YouTube tutorials here & official page here: http://www.openoffice.org
Secrets of professional presentations - a series of tutorials
PowerPoint 2007 tutorials - how to apply principles of graphic design and visual literacy to produce professional-level presentations with animations.
Tutorial video on how to use Keynote 08 which is part of Mac's iWork bundle.
& you can find more Keynote tutorials here
also an article about this here with links to both services
View more presentations from Alexei Kapterev