What techniques do you use for signposting and transitions in presenting style?

Creating variety in your presentation is a key facet of keeping your audience engaged.  When presentation a 45 minute presentation, you are usually delivering 9 x 5 minute pieces of content.  There is a general flow to this structure that enable the speaker to keep track of the presentation and allow for changes in style, mode and tempo

Using the IEAS technique as follows:
Image - Show an Image on PowerPoint, Create a Visual Image via a Story, Draw an Image on Flipchart or Whiteboard.
Explanation - Give the audience the key point and supporting information.
Activity - Mix this part up - Discussion, Story, Quiz, Poll, Debate, Lecture, Watch Video
Summary - Reinforce the key part of the information.

In addition to this method, you can use the flip chart, white board and PowerPoint differently so that the presentation moves between these three modes of communication.