If you go to the Videos > Elements 8 section of the menu you will find a list of free videos. There is a tutorial here for the new Photomerge Expsoure feature.
The Videos > Elements 6 section also has videos on other Photomerge features.
There is also a two part Scene Cleaner video tutorial (Part 1 - Montaging with Photomerge Scene Cleaner and Part 2 - Scene Cleaner Advanced Options) available in the Member Video Archives that shows you how to compose several images using Photomerge Scene Cleaner.
