Beamer is an add on package for doing presentations with LaTeX. One advantage is that authoring papers in LaTeX is then very easy to directly apply to your presentation slides. Automatically load the same tables, graphics, as you use in your papers!
A Basic Beamer Tutorial: Overview of using Beamer for presentations
TikZ Figures for Beamer: Examples with code for TikZ graphics in Beamer.
Basic Beamer Template: A basic template that shows use of itemization and sets up a top ribbon for keeping track of where in the talk you are
Multiple Authors in Beamer: Code to show how to put multiple authors on the first page of a Beamer presentation
Theme Styles and Colors: A collection of Beamer themes and colors so you can decide how to make your slides look